Physics 12 Moving Charges and Magnetism MCQ – Chapter 4

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Physics 12 Moving Charges and Magnetism MCQ question and answer, Objective type questions for CBSE class 12 physics chapter wise given in the article. This page is for UNIT III Magnetic Effects of Current and Magnetism and chapter 4 moving charges of magnetism. All the Objective type questions or MCQ of physics class 12 is here, and these are also based on NCERT physics syllabus.

Physics 12 MCQ Electrostatic Potential and Capacitance – Chapter 1

Physics 12 Moving Charges and Magnetism MCQ – Chapter 4

• |E|/|B|
• |B|/|E|
• ExB
• E.B

|E|/|B|

• 25 keV
• 50 keV
• 200 keV
• 100 keV

100 keV

Ques 3: Two particles A and B with same charges and different masses (mA and mB respectively) are moving in a plane inside uniform magnetic field which is perpendicular to the plane. The speed of the particles are VA and VB respectively and the trajectories are as shown in the figure. Then

• mAVA < mBVB
• mAVA > mBVB
• mA < mB and VA < VB
• mA = mB and VA < VB

mAVA > mBVB

Ques 4: A rectangular coil ABCD is placed near a long straight current carrying staright wire as shown. What is the net force on the rectangular coil?

• 25 x 10-7 N towards the wire
• 25 x 10-7 N away from the wire
• 35 x 10-7 N towards the wire
• 35 x 10-7 N away from the wire

25 x 10-7 N towards the wire

Ques 5: To convert a moving coil galvanometer into an ammeter of given range, we must connect:

• A suitable low resistance in series
• A suitable high resistance in series
• A suitable low resistance in parallel
• A suitable high resistance in parallel

A suitable low resistance in parallel

• 2:π
• π:2
• π:4
• 4:π

π:4

Ques 7: Current sensitivity of a galvanometer can be increased by decreasing :

• Magnetic field B
• Number of turns n
• Torsional constant k
• Area A

Torsional constant k

• B/6
• B/4
• B/3
• B/2

B/4

• B
• 2B
• 4B
• 8B

4B

• 1/r
• 1/r2
• 1/r3
• 1/r3/2

1/r3

NCERT Physics 12 MCQ of Moving Charges and Magnetism

• 2π x 10-3T
• 2π x 10-5T
• 4π x 10-3T
• 2π x 10-5T

• 8 x 10-5N
• 6 x 10-5N
• 4 x 10-5N
• 2 x 10-5N

8 x 10-5N

• halved
• doubled
• tripled

halved

Ques 14: Two thin, long parallel wires, separated by a distance d carry a current of iA in the same direction. They will

• attract each other with a force of μ0i2/(2πd2)
• attract each other with a force of μ0i2/(2πd)
• repel each other with a force of μ0i2/(2πd2)
• repel each other with a force of μ0i2/(2πd)

attract each other with a force of μ0i2/(2πd)

Ques 15: The coil of a moving coil galvanometer is wound over a metal frame in order to

• reduce hysteresis
• increase sensitivity
• increase moment of inertia
• provide electromagnetic damping

provide electromagnetic damping

• I ∝ θ2
• I ∝ tanθ
• I ∝ θ
• i ∝ √θ

I ∝ θ

Physics 12 Moving Charges and Magnetism MCQ

• 1/G
• 1/G2
• G
• G2

1/G

Ques 18: A 100 turns coil shown in the figure carries a current of 2A in a magnetic field of 0.2 Wb – m-2. The torque acting on the coil is

• 0.32 Nm tending to rotate the side AC out of the page
• 0.32 Nm tending to rotate the side AC into the page
• 0.0032 Nm tending to rotate the side AC out of the page
• 0.0032 Nm tending to rotate the side AB into the page

0.32 Nm tending to rotate the side AC out of the page

Ques 19: Time period of a charged particle undergoing a circular motion in a uniform magnetic field is independent of

• charge of the particle
• mass of the particle
• speed of the particle
• magnetic field

speed of the particle

Physics Chapter Wise MCQ Questions and Answers

These Physics 12 Moving Charges and Magnetism MCQ – Chapter 4 and other physics mcqs for class 12 chapter wise with answers pdf is available here.

Updated: November 18, 2022 — 7:43 am