Magnetism and Electromagnetism | Practice MCQs Physics for Mdcat | mosaicbro.com

Magnetism and Electromagnetism | Practice MCQs Physics for Mdcat

7 of 127 questions (Page 8 of 19)

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50 Inductance is measured in:
Correct Answer: C
Explanation: The unit of inductance is Henry.
51 A 50mH coil carries a current of 2 amp. The energy stored in its magnetic field is:
Correct Answer: B
Explanation: Energy $U = \frac{1}{2}LI^2 = 0.5 \times 0.05 \times 4 = 0.1$ J.
52 The motional emf developed in a conductor depends upon:
Correct Answer: D
Explanation: Motional emf depends on $B$, $v$, $L$, and orientation ($\theta$).
53 A generator is a device which converts:
Correct Answer: A
Explanation: Generators convert mechanical to electrical energy.
54 The emf is induced in a coil of a A.C. generator under the phenomenon of:
Correct Answer: D
Explanation: AC generators use electromagnetic induction.
55 In case of alternating current, the average value of current and voltage is:
Correct Answer: C
Explanation: The average of a sinusoidal AC signal over a full cycle is zero.
56 An A.C. voltage measures $V_0$ volts in a circuit. Its peak value is given by:
Correct Answer: D
Explanation: Peak voltage $V_p = V_{\text{rms}} \times \sqrt{2}$.
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