A bar magnet is held perpendicular to a uniform magnetic field. If the couple acting on the magnet is to be halved by rotating it, then the angle by which it is to be rotated is[2000]

Question:

Options :

(a) 30°
(b) 45°
(c) 60°
(d) 90°

Answer :

Ans ; – (c) 60°

Answer Steps :

Step 1:-

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An alternating voltage source is connected in series with a resistance R and an inductance L. If the potential drop across the resistance is 200 V and across the inductance is 150 V, then the applied voltage is:

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