The Wheatstone bridge is balanced for four resistors R1,R2,R3 and R4 with a cell of emf 1.46 V. The cell is now replaced by another cell of emf 1.08 V. To obtain the balance againa)All the four resistance should be changedb)Both the resistance R1 and R4 should be changedc)No resistance needs to be changedd)Resistance R4 should be changed onlyCorrect answer is option 'C'. Can you explain this answer?

Explore Courses UPSC Exam UPSC Test Series Free Notes EduRev Infinity

Open App

Class 12 Exam > Class 12 Questions > The Wheatstone bridge is balanced for four re...

Join the Discussion on the App

The Wheatstone bridge is balanced for four resistors R1,R2,R3 and R4 with a cell of emf 1.46 V. The cell is now replaced by another cell of emf 1.08 V. To obtain the balance again

a)
All the four resistance should be changed
b)
Both the resistance R1 and R4 should be changed
c)
No resistance needs to be changed
d)
Resistance R4 should be changed only

Correct answer is option 'C'. Can you explain this answer?

FREE This question is part of

Test: Current Electricity - 1

Attempt Test

Attempt this Test

Verified Answer

The Wheatstone bridge is balanced for four resistors R1,R2,R3 and R4 w...

The balance point of the Wheatstone’s bridge is determined by the ratio of the resistances. The change in the emf of the external battery will have no effect on the balance point.

Explanation:

Initial Balanced Wheatstone Bridge: In the initial balanced Wheatstone bridge configuration, the emf of the cell is 1.46 V and all four resistors R1, R2, R3, and R4 are set to specific values to achieve balance.

Replacement of Cell: When the cell is replaced by another cell with an emf of 1.08 V, the balance of the Wheatstone bridge is disrupted.

Requirement for Rebalancing: In order to rebalance the Wheatstone bridge with the new cell of emf 1.08 V, no resistance needs to be changed.

Reasoning: The balance of the Wheatstone bridge is determined by the ratio of the resistances in the bridge arms and not by the absolute values of the resistances. As long as the ratio of the resistances remains the same, the balance will be maintained regardless of the emf of the cell.

Conclusion: Therefore, in this scenario, no resistance needs to be changed to obtain the balance again with the new cell of emf 1.08 V.

View all questions of this test

Most Upvoted Answer

The Wheatstone bridge is balanced for four resistors R1,R2,R3 and R4 w...

Explanation:

The Wheatstone bridge is a circuit used to measure an unknown resistance by balancing two legs of a bridge circuit, one with the unknown resistance and the other with a known resistance. The condition for balance in a Wheatstone bridge is that the ratio of the two resistances in one leg of the bridge should be equal to the ratio of the two resistances in the other leg.

Given that the Wheatstone bridge is balanced for four resistors R1, R2, R3, and R4 with a cell of emf 1.46 V. This means that the resistance ratio of R1/R2 is equal to the resistance ratio of R3/R4, such that:

R1/R2 = R3/R4

Now, the cell is replaced by another cell of emf 1.08 V. To obtain the balance again, we need to find out whether any resistance needs to be changed or not.

Option (a): All the four resistance should be changed. This option is not correct because the balance condition depends only on the ratio of the resistances and not on their absolute values.

Option (b): Both the resistance R1 and R4 should be changed. This option is also not correct because changing only two resistances will change the resistance ratio of one leg of the bridge, but the resistance ratio of the other leg will remain the same.

Option (c): No resistance needs to be changed. This option is correct because the balance condition depends only on the ratio of the resistances and not on their absolute values. As the resistance ratio of R1/R2 is equal to the resistance ratio of R3/R4, the balance condition will still hold even if the cell is replaced by another cell with a different emf.

Option (d): Resistance R4 should be changed only. This option is not correct because changing only one resistance will change the resistance ratio of one leg of the bridge, but the resistance ratio of the other leg will remain the same.

Conclusion:

Hence, the correct answer is option (c) - No resistance needs to be changed.

Free Test

FREE

Test: Current Electricity - 1
30 Ques | 30 Min

Start Free Test

View all free Class 12 tests

Community Answer

The Wheatstone bridge is balanced for four resistors R1,R2,R3 and R4 w...

If two voltage divider have exactly the same ratio,the bridge is balanced. Whether the emf is changed,the ratio of the voltage dividers is still equal, so the bridge is still balanced.(because they are supplied by the same input)
R1/R2=R3/R4

Share via Whatsapp

View all answers Start learning for free

< Previous Question Next Question >

Explore Courses for Class 12 exam

Similar Class 12 Doubts

A Wheatstone bridge is balanced for four resistors R1, R2, R3 and R4 with a Lech lanche cell between A and C and a galvanometer between B and D. The positions of the cell and the galvanometer are interchanged. The balance will

View answer

A Wheatstone bridge is balanced for four resistors R1, R2, R3 and R4 with a Lech lanche cell between A and C and a galvanometer between B and D. The positions of the cell and the galvanometer are interchanged. The balance will

View answer

Read the following text and answer the following questions on the basis of the same:Types of resistors Most common type of resistor is Carbon Composition Resistors. Carbon resistors are a cheap, general purpose resistor used in electrical and electronic circuits. Their resistive element is manufactured from a mixture of finely ground carbon dust or graphite and a non-conducting ceramic powder to bind it all together. The ratio of carbon dust to ceramic (conductor to insulator) determines the resistive value of the resistor. Higher the ratio of carbon, lower the overall resistance. Film Type Resistors consist of Metal Film, Carbon Film and Metal Oxide Film .Such resistors are generally made by depositing pure metals, such as nickel, or an oxide film, such as tin-oxide, on an insulating ceramic rod or substrate. The resistive value of the resistor is controlled by increasing the desired thickness of the deposited film giving them the names of either “thick-film resistors” or “thin-film resistors”. Film type resistors can achieve much higher ohmic value compared to other types. Another type of resistor, called a Wirewound Resistor, is made by winding a thin metal alloy wire (Nichrom e) or similar wire on an insulating ceramic former in the form of a spiral helix. These types of resistors are generally only available in very low ohmic value with high precision . They are able to handle much higher electrical currents than other resistors of the same ohmic value with much excessive power ratings. These high power resistors are moulded into an aluminium heat sink body with fins attached to increase their overall surface area to promote heat loss and cooling.In carbon composition resistors, __ the ratio of carbon, _ the overall resistance.

View answer

Read the following text and answer the following questions on the basis of the same:Types of resistors Most common type of resistor is Carbon Composition Resistors. Carbon resistors are a cheap, general purpose resistor used in electrical and electronic circuits. Their resistive element is manufactured from a mixture of finely ground carbon dust or graphite and a non-conducting ceramic powder to bind it all together. The ratio of carbon dust to ceramic (conductor to insulator) determines the resistive value of the resistor. Higher the ratio of carbon, lower the overall resistance. Film Type Resistors consist of Metal Film, Carbon Film and Metal Oxide Film .Such resistors are generally made by depositing pure metals, such as nickel, or an oxide film, such as tin-oxide, on an insulating ceramic rod or substrate. The resistive value of the resistor is controlled by increasing the desired thickness of the deposited film giving them the names of either “thick-film resistors” or “thin-film resistors”. Film type resistors can achieve much higher ohmic value compared to other types. Another type of resistor, called a Wirewound Resistor, is made by winding a thin metal alloy wire (Nichrom e) or similar wire on an insulating ceramic former in the form of a spiral helix. These types of resistors are generally only available in very low ohmic value with high precision . They are able to handle much higher electrical currents than other resistors of the same ohmic value with much excessive power ratings. These high power resistors are moulded into an aluminium heat sink body with fins attached to increase their overall surface area to promote heat loss and cooling.Wirewound Resistors are made by winding a thin _ or similar wire on an former in the form of a spiral helix.

View answer

Read the following text and answer the following questions on the basis of the same:Types of resistors Most common type of resistor is Carbon Composition Resistors. Carbon resistors are a cheap, general purpose resistor used in electrical and electronic circuits. Their resistive element is manufactured from a mixture of finely ground carbon dust or graphite and a non-conducting ceramic powder to bind it all together. The ratio of carbon dust to ceramic (conductor to insulator) determines the resistive value of the resistor. Higher the ratio of carbon, lower the overall resistance. Film Type Resistors consist of Metal Film, Carbon Film and Metal Oxide Film .Such resistors are generally made by depositing pure metals, such as nickel, or an oxide film, such as tin-oxide, on an insulating ceramic rod or substrate. The resistive value of the resistor is controlled by increasing the desired thickness of the deposited film giving them the names of either “thick-film resistors” or “thin-film resistors”. Film type resistors can achieve much higher ohmic value compared to other types. Another type of resistor, called a Wirewound Resistor, is made by winding a thin metal alloy wire (Nichrom e) or similar wire on an insulating ceramic former in the form of a spiral helix. These types of resistors are generally only available in very low ohmic value with high precision . They are able to handle much higher electrical currents than other resistors of the same ohmic value with much excessive power ratings. These high power resistors are moulded into an aluminium heat sink body with fins attached to increase their overall surface area to promote heat loss and cooling.Metal Film Type Resistors are generally made by depositing pure , on rod or substrate.

View answer

The Wheatstone bridge is balanced for four resistors R1,R2,R3 and R4 with a cell of emf 1.46 V. The cell is now replaced by another cell of emf 1.08 V. To obtain the balance againa)All the four resistance should be changedb)Both the resistance R1 and R4 should be changedc)No resistance needs to be changedd)Resistance R4 should be changed onlyCorrect answer is option 'C'. Can you explain this answer?

Share with a Friend

Answer this doubt

Question Description
The Wheatstone bridge is balanced for four resistors R1,R2,R3 and R4 with a cell of emf 1.46 V. The cell is now replaced by another cell of emf 1.08 V. To obtain the balance againa)All the four resistance should be changedb)Both the resistance R1 and R4 should be changedc)No resistance needs to be changedd)Resistance R4 should be changed onlyCorrect answer is option 'C'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about The Wheatstone bridge is balanced for four resistors R1,R2,R3 and R4 with a cell of emf 1.46 V. The cell is now replaced by another cell of emf 1.08 V. To obtain the balance againa)All the four resistance should be changedb)Both the resistance R1 and R4 should be changedc)No resistance needs to be changedd)Resistance R4 should be changed onlyCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The Wheatstone bridge is balanced for four resistors R1,R2,R3 and R4 with a cell of emf 1.46 V. The cell is now replaced by another cell of emf 1.08 V. To obtain the balance againa)All the four resistance should be changedb)Both the resistance R1 and R4 should be changedc)No resistance needs to be changedd)Resistance R4 should be changed onlyCorrect answer is option 'C'. Can you explain this answer?.

Solutions for The Wheatstone bridge is balanced for four resistors R1,R2,R3 and R4 with a cell of emf 1.46 V. The cell is now replaced by another cell of emf 1.08 V. To obtain the balance againa)All the four resistance should be changedb)Both the resistance R1 and R4 should be changedc)No resistance needs to be changedd)Resistance R4 should be changed onlyCorrect answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 12. Download more important topics, notes, lectures and mock test series for Class 12 Exam by signing up for free.

Here you can find the meaning of The Wheatstone bridge is balanced for four resistors R1,R2,R3 and R4 with a cell of emf 1.46 V. The cell is now replaced by another cell of emf 1.08 V. To obtain the balance againa)All the four resistance should be changedb)Both the resistance R1 and R4 should be changedc)No resistance needs to be changedd)Resistance R4 should be changed onlyCorrect answer is option 'C'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of The Wheatstone bridge is balanced for four resistors R1,R2,R3 and R4 with a cell of emf 1.46 V. The cell is now replaced by another cell of emf 1.08 V. To obtain the balance againa)All the four resistance should be changedb)Both the resistance R1 and R4 should be changedc)No resistance needs to be changedd)Resistance R4 should be changed onlyCorrect answer is option 'C'. Can you explain this answer?, a detailed solution for The Wheatstone bridge is balanced for four resistors R1,R2,R3 and R4 with a cell of emf 1.46 V. The cell is now replaced by another cell of emf 1.08 V. To obtain the balance againa)All the four resistance should be changedb)Both the resistance R1 and R4 should be changedc)No resistance needs to be changedd)Resistance R4 should be changed onlyCorrect answer is option 'C'. Can you explain this answer? has been provided alongside types of The Wheatstone bridge is balanced for four resistors R1,R2,R3 and R4 with a cell of emf 1.46 V. The cell is now replaced by another cell of emf 1.08 V. To obtain the balance againa)All the four resistance should be changedb)Both the resistance R1 and R4 should be changedc)No resistance needs to be changedd)Resistance R4 should be changed onlyCorrect answer is option 'C'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice The Wheatstone bridge is balanced for four resistors R1,R2,R3 and R4 with a cell of emf 1.46 V. The cell is now replaced by another cell of emf 1.08 V. To obtain the balance againa)All the four resistance should be changedb)Both the resistance R1 and R4 should be changedc)No resistance needs to be changedd)Resistance R4 should be changed onlyCorrect answer is option 'C'. Can you explain this answer? tests, examples and also practice Class 12 tests.

Explore Courses for Class 12 exam