UPSC Exam  >  UPSC Tests  >  Science & Technology for UPSC CSE  >  Test: Magnetic Effects of Electric Current - 2 - UPSC MCQ

Test: Magnetic Effects of Electric Current - 2 - UPSC MCQ


Test Description

15 Questions MCQ Test Science & Technology for UPSC CSE - Test: Magnetic Effects of Electric Current - 2

Test: Magnetic Effects of Electric Current - 2 for UPSC 2025 is part of Science & Technology for UPSC CSE preparation. The Test: Magnetic Effects of Electric Current - 2 questions and answers have been prepared according to the UPSC exam syllabus.The Test: Magnetic Effects of Electric Current - 2 MCQs are made for UPSC 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Magnetic Effects of Electric Current - 2 below.
Solutions of Test: Magnetic Effects of Electric Current - 2 questions in English are available as part of our Science & Technology for UPSC CSE for UPSC & Test: Magnetic Effects of Electric Current - 2 solutions in Hindi for Science & Technology for UPSC CSE course. Download more important topics, notes, lectures and mock test series for UPSC Exam by signing up for free. Attempt Test: Magnetic Effects of Electric Current - 2 | 15 questions in 20 minutes | Mock test for UPSC preparation | Free important questions MCQ to study Science & Technology for UPSC CSE for UPSC Exam | Download free PDF with solutions
Test: Magnetic Effects of Electric Current - 2 - Question 1

The area around a magnet, in which its influence (force of attraction or repulsion) can be felt, is called its

Detailed Solution for Test: Magnetic Effects of Electric Current - 2 - Question 1

The region around a magnet, in which its influence can be felt, is called its magnetic field

Test: Magnetic Effects of Electric Current - 2 - Question 2

A constant current I flows through a horizontal metal wire in the plane of the paper from east to west as shown in the figure. The direction of magnetic field will be from north to south at a point :

Detailed Solution for Test: Magnetic Effects of Electric Current - 2 - Question 2

Let a constant current I flows through a horizontal wire from east to west. The direction of magnetic field, as per right-hand thumb rule, will be from north to south at a point directly below the current-carrying wire.

Test: Magnetic Effects of Electric Current - 2 - Question 3

The direction of magnetic field developed around a current-carrying conductor can be easily found by the use of

Detailed Solution for Test: Magnetic Effects of Electric Current - 2 - Question 3

The direction of magnetic field developed around a current-carrying conductor can be found by the use of right-hand thumb rule.

Test: Magnetic Effects of Electric Current - 2 - Question 4

Who has stated the Right hand Thumb Rule?

Detailed Solution for Test: Magnetic Effects of Electric Current - 2 - Question 4

 

The Right-hand Thumb Rule is a tool used to determine the direction of the magnetic field around a current-carrying conductor. However, there might be confusion about who specifically stated it.

  • Hans Christian Orsted discovered the relationship between electricity and magnetism.
  • James Clerk Maxwell formulated comprehensive laws of electromagnetism.
  • The rule is commonly associated with the work of Maxwell due to his contributions.

Therefore, the answer is Maxwell.

 

Test: Magnetic Effects of Electric Current - 2 - Question 5

The strength of the magnetic field around a current-carrying straight conductor

Detailed Solution for Test: Magnetic Effects of Electric Current - 2 - Question 5

The strength of the magnetic field around a current-carrying straight conductor is directly proportional to the amount of current flowing in the conductor.

Test: Magnetic Effects of Electric Current - 2 - Question 6

What should be the core of an electromagnet?

Detailed Solution for Test: Magnetic Effects of Electric Current - 2 - Question 6

The correct answer is: a) soft iron

The core of an electromagnet should be made of soft iron because it has the following properties that are ideal for an electromagnet:

  1. High Magnetic Permeability: Soft iron can easily become magnetized when an electric current flows through the surrounding coil.
  2. Low Retentivity: It loses its magnetism quickly when the current is stopped, which is essential for the electromagnet to be effective and controllable.
  3. Efficient Magnetic Induction: Soft iron enhances the strength of the magnetic field generated by the coil.

Other options are not suitable:

  • Hard iron: Retains magnetism and is not ideal for an electromagnet, as it does not allow for quick switching of the magnetic field.
  • Rusted iron: Poor conductor of magnetic flux and inefficient for creating a strong magnetic field.
  • None of the above: Incorrect, as soft iron is the best choice.
Test: Magnetic Effects of Electric Current - 2 - Question 7

The strength of a magnetic field inside a long current-carrying straight solenoid coil is

Detailed Solution for Test: Magnetic Effects of Electric Current - 2 - Question 7

The strength of a magnetic field inside a long, current-carrying, straight solenoid is uniform at all points. Moreover, the field depends on the amount of current flowing and the number of turns in solenoid coil besides its length

Test: Magnetic Effects of Electric Current - 2 - Question 8

The most important safety method used for protecting home appliances from short circuiting or overloading is

Detailed Solution for Test: Magnetic Effects of Electric Current - 2 - Question 8

It is most important method for protecting the electrical devices from short circuiting or overloading by stopping the flow of any large electric current exceeds from its rating.

Test: Magnetic Effects of Electric Current - 2 - Question 9

The strength of magnetic field along the axis of a solenoid coil :

Detailed Solution for Test: Magnetic Effects of Electric Current - 2 - Question 9

The strength of magnetic field along the axis of a solenoid coil increases on increasing the current flowing through the solenoid coil and on increasing the number of turns in the solenoid coil. Moreover, if a soft iron core is inserted inside the solenoid coil then magnetic field increases many fold.

Test: Magnetic Effects of Electric Current - 2 - Question 10

A current-carrying conductor is placed perpendicular to the direction of a uniform magnetic field. The direction of force acting on the conductor due to magnetic field is given by

Detailed Solution for Test: Magnetic Effects of Electric Current - 2 - Question 10

When a current-carrying straight conductor is placed perpendicular to the direction of a uniform magnetic field, it experiences a mechanical force. The direction of mechanical force is given by Fleming’s left-hand rule.

Test: Magnetic Effects of Electric Current - 2 - Question 11

When a straight conductor is carrying current:

Detailed Solution for Test: Magnetic Effects of Electric Current - 2 - Question 11
  • The Right-Hand Thumb Rule states that if you point the thumb of your right hand in the direction of current flow, your curled fingers indicate the direction of circular magnetic field lines around the conductor.
  • These magnetic field lines form concentric circles around the conductor.
Test: Magnetic Effects of Electric Current - 2 - Question 12

For a current in a long straight solenoid N-pole and S-poIe are created at the two ends. Among the following statements, the incorrect statement is

Detailed Solution for Test: Magnetic Effects of Electric Current - 2 - Question 12

A solenoid behaves like a bar magnet. Hence the pattern of magnetic field associated with solenoid and around the bar magnet is same.

Test: Magnetic Effects of Electric Current - 2 - Question 13

Choose the wrong statement out of the following :

Detailed Solution for Test: Magnetic Effects of Electric Current - 2 - Question 13

Like magnetic poles (say N- and N-poles) always repel each other.

Test: Magnetic Effects of Electric Current - 2 - Question 14

If the circuit is closed and magnetic field lines are drawn over the horizontal plane ABCD, the lines are

Detailed Solution for Test: Magnetic Effects of Electric Current - 2 - Question 14

- When a circuit carrying current is closed, it generates a magnetic field around it.
- According to Ampère's circuital law and the right-hand rule, the magnetic field lines around a straight current-carrying conductor form concentric circles.
- These circles are centered on the wire, and their planes are perpendicular to the direction of the current.
- Therefore, on a horizontal plane like ABCD, the magnetic field lines appear as concentric circles, making option A correct.

Test: Magnetic Effects of Electric Current - 2 - Question 15

A boy was making a model of an electric bell. He connected the coil in the circuit and switched it on. However, the magnetism produced in the coil was not strong enough. He made some changes in the coil and the circuit was now working. What changes did the boy make in the coil?

Detailed Solution for Test: Magnetic Effects of Electric Current - 2 - Question 15

The correct answer is: C) Increase in the number of turns in the coil

To increase the strength of the magnetic field produced by a coil, the following changes could help:

  • Increasing the number of turns in the coil: This directly increases the magnetic field strength. More turns mean that for a given current, the magnetic effect is stronger.

Decreasing the number of turns or replacing the coil would not enhance the magnetism. Therefore, option C is the correct change the boy likely made.

114 videos|429 docs|209 tests
Information about Test: Magnetic Effects of Electric Current - 2 Page
In this test you can find the Exam questions for Test: Magnetic Effects of Electric Current - 2 solved & explained in the simplest way possible. Besides giving Questions and answers for Test: Magnetic Effects of Electric Current - 2, EduRev gives you an ample number of Online tests for practice
114 videos|429 docs|209 tests
Download as PDF