Class 12 Physics MCQ Chapter 4 Moving Charges and Magnetism Solutions English Medium to each chapter is provided in the list so that you can easily browse through different chapters Class 12 Physics MCQ Chapter 4 Moving Charges and Magnetism Question Answer in English and select need one. AHSEC Class 12 Physics Objective Type Question Answer As Per AHSEC New Book Syllabus Download PDF. AHSEC Physics MCQ Class 12 Solutions.
Class 12 Physics MCQ Chapter 4 Moving Charges and Magnetism
Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. AHSEC Class 12 Physics Multiple Choice Solutions in English Medium are part of All Subject Solutions. Here we have given AHSEC Class 12 Physics MCQ Question Answer English Medium for All Chapters, You can practice these here.
Moving Charges and Magnetism
Chapter: 4
| MCQs |
Choose the correct option:
1. The north pole of a magnet is brought near a stationary negatively charged conductor. What is the force experienced by it at the poles?
(a) Maximum.
(b) Minimum.
(c) Zero.
(d) Depends on the nature of the conductor.
Ans: (c) Zero.
2. A current of 0.1 A circulates around a coil of 100 turns and having a radius equal to 5 cm. The magnetic field set up at the centre of the coil is:
(a) 4𝜋 × 10-5 T
(c) 4 × 10-5 T
(b) 8𝜋 × 10-6 T
(d) 2 × 10-5 T
Ans: (a) 4𝜋 × 10-5 T
3. There are two solenoids having lengths L and 2L and the number of loops N And 4N. Also, the same current is flowing in both. What is the ratio of a magnetic field?
(a) 1:3
(b) 1:5
(c) 1:2
(d) 1:4
Ans: (c) 1:2
4. A straight wire of diameter 0.5 mm carrying a current of 1A is replaced by another wire of 1 mm diameter carrying the same current. The magnetic field at the same distance from the wire is:
(a) Twice the earlier value.
(b) One-half of the earlier value.
(c) One-quarter of the earlier value.
(d) No change.
Ans: (d) No change.
5. There are 50 turns of a wire in every cm length of a solenoid. If 4A current is flowing in the solenoid, the approximate value of the magnetic field along its axis at the internal point and at one end will be in Wb / (m2) respectively.
(a) 2.51 × 10-3 : 12.6 × 10-3
(b) 25.1 × 10-5 : 12.6 × 10-5
(c) 12.6 × 10-3 : 25.1 × 10-3
(d) 12.6 × 10-3 : 6.3 × 10-3
Ans: (c) 12.6 × 10-3 : 25.1 × 10-3
6. A current passing through a circular coil of two turns produces a magnetic field B at its centre. The coil is then rewound so as to have four turns and the same current is passed through it. Now magnetic field at the centre of the coil is:
(a) 2 B
(b) 4 B
(c) B/2
(d) B/4
Ans: (b) 4 B
7. When a particle having a charge e and mass m moves with the velocity v in a magnetic field B which is applied perpendicular to the motion to the particle. What is the radius r of its path in the magnetic field?
(a) Be/mv.
(b) ev/Bm.
(c) Bv/em.
(d) mv/Be.
Ans: (d) mv/Be.
8. The magnetic field inside a solenoid is:
(a) Directly proportional to its length.
(b) Inversely proportional to current.
(c) Directly proportional to current.
(d) Inversely proportional to total number of turns.
Ans: (c) Directly proportional to current.
9. A proton moving with a velocity of 2.5 × 107 m/s enters a magnetic field of 2.5 T making an angle 30° with the magnetic field. The force on the proton is:
(a) 5 × 10-12 N
(c) 6 × 10-12 N
(b) 3 × 10-12 N
(d) 9 × 10-12 N
Ans: (a) 5 × 10-12 N
10. A particle having charge 100 times that of an electron is revolving in a circular path of radius 0.8 m with one rotation per second. The magnetic field produced at the centre is:
(a) 10-3 μ0
(b) 10-11μ0
(c) 10-7 μ0
(d) 10-17 μ0
Ans: (d) 10-17 μ0.
11. How a moving coil galvanometer is converted into a voltmeter?
(a) By introducing a resistance of small value in series.
(b) By introducing a resistance of small value in parallel.
(c) By introducing a resistance of large value in series.
(d) By introducing a resistance of large value in parallel.
Ans: (c) By introducing a resistance of large value in series.
12. A soft iron ring has a mean diameter of 0.20 m and an area of cross-section 5 × 10-4 m2 It is uniformly wound with 2000 turns carrying a current of 2A and the magnetic flux in the iron is 8 ×10-3 Wb. What is the relative permeability of iron?
(a) 4000
(b) 3000
(c) 2000
(d) 1000
Ans: (c) 2000
13. If a hydrogen atom, the electron is making 6.6 × 1015 rev./sec around the nucleus in an orbit of radius 0.528 Å. The magnetic moment will be:
(a) 1 × 10-15 Am²
(b) 1 × 10-10 Am²
(c) 1 × 10-23 Am²
(d) 1 × 10-27 Am²
Ans: (c) 1 × 10-23 Am²
14. What is the force exerted by a stationary charge when it is placed in a magnetic field?
(a) Zero.
(b) Maximum.
(c) Minimum.
(d) Depends on the strength of the magnetic field.
Ans: (a) Zero.
15. A long solenoid has 800 turns per metre length of solenoid, A current of 1.6A flows through it. The magnitude induction at the end of the solenoid on its axis is:
(a) 16 × 10-4 T
(b) 8 × 10-4 T
(c) 32 × 10-4 T
(d) 4 × 10-4 T
Ans: (b) 8 × 10-4 T
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