## Magnetic moment and Torque- MCQ-Basic

Physics is an important subject in preparation for various Competitive exams. To keep a track of your preparation we have designed a small quiz of 10 Basic Level Questions on Magnetic moment and Torque.You have 10 minutes to solve the quiz, click the start timer button in order to start the timer and then click on submit button at the end to submit the quiz and view your scores and correct answers.

Q1. The magnetic moment of a current (i) carrying circular coil of radius (r) and number of turns (n) varies as

•  1/r2
•  1/r
•  r
•  r2

r2

Q2. A circular coil having N turns is made from a wire of length L meter. If a current i ampere is passed through it and is placed in a magnetic field of B Tesla, the maximum torque on it is

•  Directly proportional to N
•  Inversely proportional to N
•  Directly proportional to N2
•  Independent of N

Directly proportional to N

Q3. A small cylinderical soft iron piece is kept in a galvanometer so that

•  A radial uniform magnetic field is produced
•  A uniform magnetic field is produced
•  There is a steady deflection of the coil
•  All of the above

All of the above

Q4. Two galvanometers A and B require 3mA and 5mA respectively to produce the same deflection of 10 division then

•  A is more sensitive than B
•  B is more sensitive than A
•  A and B are equally sensitive
•  Sensitiveness of B is twice that of A

A is more sensitive than B

Q5. A circular loop has a radius of 5 cm and it is carrying a current of 0.1 amp. It magnetic moment is

•  1.32 X 10-4amp -m2
•  2.62 X 10-4amp -m2
•  5.25 X 10-4amp -m2
•  7.85 X 10-4amp -m2

7.85 X 10-4amp -m2

Q6. Magnetic dipole moment of a rectangular loop is

•  Inversely proportional to current in loop
•  Inversely proportional to area of loop
•  Parallel to plane of loop and proportional to area of loop
•  Perpendicular to plane of loop and proportional to area of loop

Perpendicular to plane of loop and proportional to area of loop

Q7. The magnetic moment of a circular coil carrying current is

•  Directly proportional to the length of the wire in the coil
•  Inversely proportional to the length of the wire in the coil
•  Directly proportional to the square of the length of the wire in the coil
•  Inversely proportional to the square of the length of the wire in the coil

Directly proportional to the square of the length of the wire in the coil

Q8. A current loop of area 0.01 m2 and carrying a current of 10 amperes is held perpendicular to a magnetic field of intensity of 0.1 Tesla. The torque (in Nm) acting of the loop is

•  0
•  0.001
•  0.01
•  1.1

0

Q9. The current sensitivity of a moving coil galvanometer can be increased by

•  Increasing the magnetic field of the permanent magnet
•  Increasing the area of the deflecting coil
•  Increasing the number of turns in the coil
•  All of these

All of these

Q10. A rectangular coil 20 cm X 20 cm has 100 turns and carries a current of 1 A. It is placed in a uniform magnetic field B = 0.5 T with the direction of magnetic field parallel to the plane of the coil. The magnitude of the torque required to hold this coil in this position is

•  Zero
•  200 N-m
•  2 N-m
•  10 N-m

2 N-m

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