Physics 12 Moving Charges and Magnetism MCQ – Chapter 4

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


Ques 1: In a certain region of space, electric field vecE and magnetic field vecB are perpendicular to each other. An electron enters perpendicularly to both the fields and moves undeflected. The velocity of electron is

  • |E|/|B|
  • |B|/|E|
  • ExB
  • E.B

|E|/|B|

Ques 2: A deutron of kinetic energy 50 keV is describing a circular orbits of radius 0.5m in a plane perpendicular to the magnetic field vecB. The kinetic energy of the proton that describes a circular orbit of same radius and inside same vecB is

  • 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

Ques 6: Two wires of same length are shaped into a square and a circle if they carry same current, ratio of magnetic moment is :

  • 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

Ques 8: An electric current passes through a long straight copper wire. At a distance 5cm from the straight wire, the magnetic field is B. The magnetic field at 20cm from the straight wire would be

  • B/6
  • B/4
  • B/3
  • B/2

B/4

Ques 9: A wire in the form of a circular loop, of one turn carrying a current, produces magnetic induction B at the centre. If the same wire is looped into a coil of two turns and carrying the same current, the new value of magnetic induction at the centre is

  • B
  • 2B
  • 4B
  • 8B

4B

Ques 10: A circular coil of radius a carries an electric current. The magnetic field sue the coil at a point on the axis of the coil located at a distance r from centre of the coil, such that r>>a, varies

  • 1/r
  • 1/r2
  • 1/r3
  • 1/r3/2

1/r3

NCERT Physics 12 MCQ of Moving Charges and Magnetism

 

Ques 11: A solenoid has 1000 turns per metre length. If a current of 5A is flowing through it, then magnetic field inside the solenoid is

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

Ques 12: Currents of 10A and 2A are flowing in opposite directions through two parallel wires A and B respectively. If the wire A is infinitely long and wire B is 2m long, then force on wire B which is situated at 10cm from A, is

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

8 x 10-5N

Ques 13: If distance between two current carrying wires is doubled, then force between them is

  • halved
  • doubled
  • tripled
  • quadrupled

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

Ques 16: If in a moving coil galvanometer, a current I in its coil produces a deflection θ, then

  • I ∝ θ2
  • I ∝ tanθ
  • I ∝ θ
  • i ∝ √θ

I ∝ θ

Physics 12 Moving Charges and Magnetism MCQ

Ques 17: The ratio of voltage sensitivity (VS) and current sensitivity (IS) of a moving coil galvanometer is

  • 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

  1. Electrostatic Charges and Fields MCQ – Chapter 1
  2. Electrostatic Potential and Capacitance MCQ – Chapter 2
  3. Current Electricity MCQ Question Answer – Chapter 3
  4. Moving Charges and Magnetism MCQ – Chapter 4
  5. Magnetism And Matter MCQ – Chapter 5
  6. Electromagnetic Induction MCQ – Chapter 6
  7. MCQ Alternating Current MCQ – Chapter 7
  8. Electromagnetic Waves MCQ – Chapter 8
  9. Ray Optics And Optical Instruments MCQ – Chapter 9
  10. MCQ Wave Optics MCQ – Chapter 10
  11. Dual Nature of Radiation and Matter MCQ – Chapter 11
  12. Atoms MCQ – Chapter 12

physics 12 mcq

 

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: December 4, 2021 — 3:03 pm

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