A bar magnet is hung by a thin cotton thread in a uniform horizontal magnetic field and is in equilibrium state. The energy required to rotate it by 60° is W. Now the torque required to keep the magnet in this new position is

Question:

Options :

(a) √3W /2
(b) 2W / √3
(c) W / √3
(d) √3W

Answer :

(d) √3W

Answer Steps :

step 1:

step 2:

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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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