Answer :

Here, from Bohr’s quantization rule, we know angular momentum (L) is given by,



Where n=0,1,2….. and h=Planck’s Constant.


Now, the initial angular momentum is


And, the final angular momentum is


Now from the relation between angular momentum(L) and torque(τ), we have




Putting



Hence, option (b) is the correct answer.

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