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

Magnetism and Electromagnetism | Practice MCQs Physics for Mdcat

7 of 127 questions (Page 13 of 19)

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85 Magnetic field is measured by:
Correct Answer: C
Explanation: Fluxmeters measure magnetic flux or field strength.
86 Which of the following substance will be most suitable for the transformer core:
Correct Answer: A
Explanation: Soft iron has high permeability and low hysteresis loss.
87 A choke coil is used as a resistance in:
Correct Answer: D
Explanation: Chokes provide inductive reactance in AC circuits.
88 A.C. has replaced D.C. in our homes because:
Correct Answer: A
Explanation: AC is preferred for long-distance transmission due to lower energy loss.
89 When a coil is moved in a magnetic field, the induced emf in it depends on:
Correct Answer: C
Explanation: Faraday’s law: $\mathcal{E} = -d\Phi/dt$.
90 The ratio of the turns in the primary and secondary coil of transformer is 10, then the ratio of e.m.f. will be:
Correct Answer: C
Explanation: Turns ratio $N_p/N_s = 10$ implies $V_p/V_s = 10$.
91 A current is flowing north along a power line. The direction of the magnetic field above it, neglecting the earth’s field, is:
Correct Answer: C
Explanation: Right-hand rule: thumb (current north), fingers curl east above the wire.
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