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

Magnetism and Electromagnetism | Practice MCQs Physics for Mdcat

7 of 127 questions (Page 11 of 19)

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71 A wire loop is moved parallel to a uniform magnetic field. The induced emf in the loop:
Correct Answer: D
Explanation: No flux change occurs if motion is parallel to $\vec{B}$.
72 Henry is the unit of:
Correct Answer: C
Explanation: Henry measures both self and mutual inductance.
73 The inductance of a coil plays the same role as:
Correct Answer: D
Explanation: Inductance opposes changes in current, analogous to inertia.
74 An alternating current is that which:
Correct Answer: A
Explanation: AC changes magnitude and direction periodically.
75 An A.C. voltmeter measures $V_0$ volts in a circuit. Its peak value is:
Correct Answer: A
Explanation: Peak voltage $V_p = V_{\text{rms}} \times \sqrt{2}$.
76 According to Faraday’s law, the emf induced in a conductor that is moved in magnetic field depends upon:
Correct Answer: B
Explanation: Faraday’s law: $\mathcal{E} = -d\Phi/dt$.
77 A transformer is used to:
Correct Answer: A
Explanation: Transformers adjust AC voltage levels.
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