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

Magnetism and Electromagnetism | Practice MCQs Physics for Mdcat

7 of 127 questions (Page 17 of 19)

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113 The change of magnetic flux through a circuit will produce:
Correct Answer: C
Explanation: Faraday’s law: changing flux induces emf.
114 A device used for converting AC into DC is:
Correct Answer: B
Explanation: Rectifiers convert AC to DC.
115 In Pakistan, the voltage stepped down for domestic use is:
Correct Answer: B
Explanation: Pakistan uses 220V for domestic supply.
116 The magnetic flux through the area A is:
Correct Answer: B
Explanation: Flux is the dot product $\Phi = \vec{B} \cdot \vec{A}$.
117 When a wire of length 3 cm is moved with a velocity of 2m/s perpendicularly in a magnetic field of strength 10 tesla then the e.m.f. induced is:
Correct Answer: C
Explanation: $\mathcal{E} = BvL = 10 \times 2 \times 0.03 = 0.6$ V.
118 A 15 cm wire, moving with a velocity 2 m/sec acquires an induced e.m.f. of 0.003 V whenever dragged in a magnetic field of strength:
Correct Answer: A
Explanation: $B = \mathcal{E}/(vL) = 0.003/(2 \times 0.15) = 0.01$ T.
119 Which one of the following is magnitude of force acting on 1 m long wire carrying current 2A and held perpendicular to the magnetic field of 1 / 2 tesla?
Correct Answer: A
Explanation: $F = BIL = 0.5 \times 2 \times 1 = 1$ N.
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