NEET Exam > NEET Questions > A meter bridge is used to determine the resi...
Start Learning for Free
A meter bridge is used to determine the resistance of an unknown wire by measuring the balance point length l. If the wire is replaced by another wire of same material but with double the length and half the thickness, the balancing point is expected to be
- a)1 / 8l
- b)1 / 4l
- c)8l
- d)16l
Correct answer is option 'C'. Can you explain this answer?
| FREE This question is part of | Download PDF Attempt this Test |
Most Upvoted Answer
A meter bridge is used to determine the resistance of an unknown wire...
In a meter bridge the ratio of two resistances is
Where l and l′ are balancing lengths.
Resistance 
In material remains same ρ = ρ′
Given, l′ = 2l
r′ = r / 2
∴ 
R′ = 8R
Therefore, the new balancing point is expected to be 8l.
Free Test
FREE
| Start Free Test |
Community Answer
A meter bridge is used to determine the resistance of an unknown wire...
The meter bridge is a device used to measure the resistance of an unknown wire by finding the balance point. The balance point is the position on the meter bridge where there is no current flowing through the galvanometer, indicating that the resistance on both sides of the bridge is equal.
When the wire is replaced by another wire of the same material but with double the length and half the thickness, the balancing point is expected to change. Let's understand why this happens:
1. Resistance of a wire:
- The resistance of a wire depends on its length, cross-sectional area, and resistivity of the material.
- The resistance of a wire is directly proportional to its length and resistivity, and inversely proportional to its cross-sectional area.
2. Effect of doubling the length:
- When the length of the wire is doubled, its resistance also doubles.
- This happens because the longer wire offers more opposition to the flow of current.
3. Effect of halving the thickness:
- When the thickness of the wire is halved, its resistance becomes four times.
- This happens because the cross-sectional area is reduced by half, which increases the resistance.
4. Balancing point on the meter bridge:
- The balancing point on the meter bridge depends on the ratio of the resistances on both sides of the bridge.
- If the resistances on both sides are equal, the bridge is balanced, and no current flows through the galvanometer.
- The balancing point is determined by adjusting the position of the jockey on the wire.
5. Changes in balancing point:
- When the wire is replaced by another wire with double the length and half the thickness, the resistance of the wire changes.
- Doubling the length of the wire doubles its resistance, while halving the thickness increases its resistance four times.
- As a result, the overall resistance of the wire increases.
- To balance the bridge, the jockey needs to be moved towards the unknown wire, indicating that the balancing point has shifted towards the unknown wire.
Therefore, the balancing point is expected to be 8 times the original length (8l) when the wire is replaced by another wire with double the length and half the thickness. So, option 'C' is the correct answer.
When the wire is replaced by another wire of the same material but with double the length and half the thickness, the balancing point is expected to change. Let's understand why this happens:
1. Resistance of a wire:
- The resistance of a wire depends on its length, cross-sectional area, and resistivity of the material.
- The resistance of a wire is directly proportional to its length and resistivity, and inversely proportional to its cross-sectional area.
2. Effect of doubling the length:
- When the length of the wire is doubled, its resistance also doubles.
- This happens because the longer wire offers more opposition to the flow of current.
3. Effect of halving the thickness:
- When the thickness of the wire is halved, its resistance becomes four times.
- This happens because the cross-sectional area is reduced by half, which increases the resistance.
4. Balancing point on the meter bridge:
- The balancing point on the meter bridge depends on the ratio of the resistances on both sides of the bridge.
- If the resistances on both sides are equal, the bridge is balanced, and no current flows through the galvanometer.
- The balancing point is determined by adjusting the position of the jockey on the wire.
5. Changes in balancing point:
- When the wire is replaced by another wire with double the length and half the thickness, the resistance of the wire changes.
- Doubling the length of the wire doubles its resistance, while halving the thickness increases its resistance four times.
- As a result, the overall resistance of the wire increases.
- To balance the bridge, the jockey needs to be moved towards the unknown wire, indicating that the balancing point has shifted towards the unknown wire.
Therefore, the balancing point is expected to be 8 times the original length (8l) when the wire is replaced by another wire with double the length and half the thickness. So, option 'C' is the correct answer.
Attention NEET Students!
To make sure you are not studying endlessly, EduRev has designed NEET study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in NEET.
|
Explore Courses for NEET exam
|
|
Similar NEET Doubts
Top Courses for NEETView all
A meter bridge is used to determine the resistance of an unknown wire by measuring the balance point length l. If the wire is replaced by another wire of same material but with double the length and half the thickness, the balancing point is expected to bea)1 / 8lb)1 / 4lc)8ld)16lCorrect answer is option 'C'. Can you explain this answer?
Question Description
A meter bridge is used to determine the resistance of an unknown wire by measuring the balance point length l. If the wire is replaced by another wire of same material but with double the length and half the thickness, the balancing point is expected to bea)1 / 8lb)1 / 4lc)8ld)16lCorrect answer is option 'C'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about A meter bridge is used to determine the resistance of an unknown wire by measuring the balance point length l. If the wire is replaced by another wire of same material but with double the length and half the thickness, the balancing point is expected to bea)1 / 8lb)1 / 4lc)8ld)16lCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A meter bridge is used to determine the resistance of an unknown wire by measuring the balance point length l. If the wire is replaced by another wire of same material but with double the length and half the thickness, the balancing point is expected to bea)1 / 8lb)1 / 4lc)8ld)16lCorrect answer is option 'C'. Can you explain this answer?.
A meter bridge is used to determine the resistance of an unknown wire by measuring the balance point length l. If the wire is replaced by another wire of same material but with double the length and half the thickness, the balancing point is expected to bea)1 / 8lb)1 / 4lc)8ld)16lCorrect answer is option 'C'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about A meter bridge is used to determine the resistance of an unknown wire by measuring the balance point length l. If the wire is replaced by another wire of same material but with double the length and half the thickness, the balancing point is expected to bea)1 / 8lb)1 / 4lc)8ld)16lCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A meter bridge is used to determine the resistance of an unknown wire by measuring the balance point length l. If the wire is replaced by another wire of same material but with double the length and half the thickness, the balancing point is expected to bea)1 / 8lb)1 / 4lc)8ld)16lCorrect answer is option 'C'. Can you explain this answer?.
Solutions for A meter bridge is used to determine the resistance of an unknown wire by measuring the balance point length l. If the wire is replaced by another wire of same material but with double the length and half the thickness, the balancing point is expected to bea)1 / 8lb)1 / 4lc)8ld)16lCorrect answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for NEET.
Download more important topics, notes, lectures and mock test series for NEET Exam by signing up for free.
Here you can find the meaning of A meter bridge is used to determine the resistance of an unknown wire by measuring the balance point length l. If the wire is replaced by another wire of same material but with double the length and half the thickness, the balancing point is expected to bea)1 / 8lb)1 / 4lc)8ld)16lCorrect answer is option 'C'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
A meter bridge is used to determine the resistance of an unknown wire by measuring the balance point length l. If the wire is replaced by another wire of same material but with double the length and half the thickness, the balancing point is expected to bea)1 / 8lb)1 / 4lc)8ld)16lCorrect answer is option 'C'. Can you explain this answer?, a detailed solution for A meter bridge is used to determine the resistance of an unknown wire by measuring the balance point length l. If the wire is replaced by another wire of same material but with double the length and half the thickness, the balancing point is expected to bea)1 / 8lb)1 / 4lc)8ld)16lCorrect answer is option 'C'. Can you explain this answer? has been provided alongside types of A meter bridge is used to determine the resistance of an unknown wire by measuring the balance point length l. If the wire is replaced by another wire of same material but with double the length and half the thickness, the balancing point is expected to bea)1 / 8lb)1 / 4lc)8ld)16lCorrect answer is option 'C'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice A meter bridge is used to determine the resistance of an unknown wire by measuring the balance point length l. If the wire is replaced by another wire of same material but with double the length and half the thickness, the balancing point is expected to bea)1 / 8lb)1 / 4lc)8ld)16lCorrect answer is option 'C'. Can you explain this answer? tests, examples and also practice NEET tests.
|
|
Explore Courses for NEET exam
|
|
Suggested Free Tests
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
Follow Us
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup