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Q.

The time period of bar magnet in uniform magnetic field is T. If an identical brass rod is placed over the bar magnet.Then time period of combination in the same field is

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a

$2 T$

b

$\frac{T}{2}$

c

$\sqrt{2} T$

d

$\frac{T}{\sqrt{2}}$

answer is C.

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Detailed Solution

$\frac{T_{1}}{T_{2}} = \sqrt{\frac{I_{1}}{I_{2}}}$ Brass rod Non-magnetic

$I_{1} = I, I_{2} = 2 I$

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The time period of bar magnet in uniform magnetic field is T. If an identical brass rod is placed over the bar magnet.Then time period of combination in the same field is