Bihar Board - Class 12 Physics - Chapter 4: Moving Charges and Magnetism Multiple Choice Questions (MCQs)
For Class 12 Bihar Board, the chapter Moving Charges and Magnetism in Physics explain the relationship between moving electric charges and magnetic fields, including Lorentz force, Ampere's law, and the Biot-Savart law. You can also find the multiple-choice questions that help in mastering these topics and preparing effectively for exams on Vidyakul.
Multiple Choice Question
1. Oersted concluded that _____ produces magnetic fields in the surrounding space.
(A) Moving Charges
(B) Currents
(C) Both (A) and(B)
(D) None
Answer: (C) Both (A) and(B)
2. Radio waves were discovered by
(A) J. C. Bose
(B) Hertz
(C) G. Marconi
(D) None
Answer: (B) Hertz
3. Consider the following sources:
1. A permanent magnet
2. A charged disc rotating at uniform speed
3. An accelerated charge
4. An electric field which changes linearly with time
Which of the above sources are the sources of steady magnetic field?
(A) 1, 2 and 3 only
(B) 3 and 4 only
(C) 1, 2 and 4 only
(D) Both (A) and (B)
Answer: (C) 1, 2 and 4 only
4. Force on a negative charge is opposite to that on a
(A) Positive charge
(B) Negative charge
(C) Neutral charge
(D) None
Answer: (A) positive charge
5. When velocity and magnetic field vectors are parallel or antiparallel then force due to magnetic field is
(A) Constant
(B) Unity
(C) Zero
(D) Infinity
Answer: (C) zero
6. If the charges are not in motion then magnetic force is
a) Zero
b) Unity
c) Infinity
d) Constant
Answer: (A) zero
7. The unit of magnetic field is
a) Ampere
b) Tesla
(C) Both (A) and(B)
d) Weber
Answer: (B) Tesla
8. The smaller unit of magnetic flux density is
(A) Weber
(B) Tesla
(C) Gauss
(D) None
Answer: (C) gauss
9. 1 gauss =
(A) 10-4 Tesla
(B) 10-6Tesla
(C) 10-5Tesla
(D) None
Answer: (A) 10-4 Tesla
10. What are the 3 types of magnets?
(A) 1
(B) 3
(C) 2
(D) 4
Answer: (B) 3
11. The electromagnetic force ____ on the medium between the two charges or magnets.
(A) Does not depends
(B) Depends
(C) Both (A) and(B)
(D) None
Answer: (B) depends
12. A charged particle passes through an electric field 'E' and magnetic field 'B' in mutually perpendicular directions. Find the velocity of the charged particle if it goes undeflected through both fields.
(A) E × B
(B) B/E
(C) E/B
(D) E + B
Answer: (C) E/B
13. If w is the angular frequency then v =
(A) V = rw
(B) V = w/r
(C) V = r/w
(D) None
Answer: (A) V= rw
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