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A conducting slider of resistance R (10O...

A conducting slider of resistance R `(10Omega)`, mass 50 g & length 10 cm is kept on a U-shaped frame as shown in figure.There is uniform magnetic field `(B=0.1 T)` perpendicular to plane of frame.The slider is attached to a spring `(K=0.5 N//m)`.It is displaced by `A_(0)` & released time is which amplitude become `A_(0)//e` is (A) 9000 s (B) 10000 s (C) 12000 s (D) 15000 s

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