Class 12 Physics MCQ Chapter 6 Electromagnetic Induction 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 6 Electromagnetic Induction 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 6 Electromagnetic Induction
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.
Electromagnetic Induction
Chapter: 6
| MCQs |
Choose the correct option:
1. A current of 3A flowing in the primary coil is reduced to zero in 0.001 s, the induced e.m.f. in the secondary is 15000 V. The mutual inductance between the two coil is:
(a) 0.5 H.
(b) 5 H.
(c) 1.5 H.
(d) 10 H.
Ans: (b) 5 H.
2. Pick out the SI unit of magnetic flux.
(a) Ampere.
(b) Tesla metre.
(c) Weber.
(d) Maxwell.
Ans: (c) Weber.
3. A magnetic field of 2 × 10-2 T acts at right angles to a coil of area 100 cm² with 50 turns. The average e.m.f. induced in the coil is 0.1 V when it is removed from the field in t sec. The value of t is:
(a) 0.1 s
(b) 10 s
(c) 0.01 s
(d) 1.s
Ans: (a) 0.1 s
4. Two inductors each of inductance L are connected in parallel. What is their equivalent inductance?
(a) 2L.
(b) L.
(c) L/2.
(d) L/4.
Ans: (c) L/2.
5. Which of the following is a unit of magnetic flux?
(a) Maxwell.
(b) Gauss.
(c) Tesla.
(d) Ampere.
Ans: (a) Maxwell.
6. In a coil of self inductance 5 H, the rate of change of current is 2 amperes per second. The e.m.f. induced in the coil is:
(a) 10 V.
(b) 5 V.
(c) -5 V.
(d) – 10 V.
Ans: (a) 10 V.
7. A current varying at the rate of 3 A/s in a coil generates an e.m.f. of 8 mV in a nearby coil. The mutual inductance of the two coil is:
(a) 2.66 Η.
(b) 2.66 × 10-3 mH.
(c) 0.266 H.
(d) 2.66 mH.
Ans: (d) 2.66 mH.
8. When is the magnetic flux said to be positive?
(a) θ = 180°
(b) θ = 360°
(c) θ = 0°
(d) θ = 90°
Ans: (c) θ = 0°
9. In the changing (increasing) magnetic field is passing perpendicular to the plane of the coil and directed into the paper. What is the direction of the induced current through the resistor R?
(a) X to Y.
(b) Y to X.
(c) No current.
(d) No e.m.f. Induced.
Ans: (a) X to Y.
10. A coil is wound on a core of a rectangular cross- section. If all the linear dimensions are increased by a factor 2 and number of turns per unit length of coil remains the same, the self inductance increases by a factor:
(a) 16
(b) 4
(c) 8
(d) 2
Ans: (a) 16
11. Which type of physical quantity is magnetic flux?
(a) Scalar.
(b) Vector.
(c) Isotropic.
(d) Isentropic.
Ans: (a) Scalar.
12. A coil has an area of 0.05 m² and has 800 turns. After placing the coil in a magnetic field of strength 4 x 10-5 Wb/m², perpendicular to the field, the coil is rotated through 90° in 0.1 s. The average e.m.f. induced is L:
(a) Zero.
(c) 0.01 V.
(b) 0.016 V.
(d) 0.032 V.
Ans: (b) 0.016 V.
13. During a current change from 2 A to 4 A in 0.05 second, 8 V of e.m.f. is developed in the coil. The coefficient of self-induction is:
(a) 0.1 Η.
(c) 0.8 H.
(b) 0.4 H.
(d) 0.2 H.
Ans: (d) 0.2 H.
14. Give the SI unit of self-inductance.
(a) Farad.
(b) Ampere.
(c) Henry.
(d) Maxwell.
Ans: (c) Henry.
15. Two coils have a mutual inductance of 0.005 H. The current changes in the first coil according to the equation Ⅰ = Ⅰ0 sin ωt where Ⅰ0 = 10 A and ω = 100𝜋 rad/se. The maximum value of e.m.f. In the second coil is:
(α) 5 𝜋 volts.
(b) 2𝜋 volts’.
(c) 𝜋 volts.
(d) 4𝜋 volts.
Ans: (α) 5 𝜋 volts.
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