A thin strip 10 cm long is on a U shaped wire of negligible resistance and it is connected to a spring of spring constant 0.5Nm⁻¹
(see figure). The assembly is kept in a uniform
magnetic field of 0.1 T. If the strip is pulled from its equilibrium position and released, the number of oscillations it performs before its amplitude decreases by a factor of e is N. If the mass of the strip is 50 grams, its resistance 10Ω
and air drag negligible, N will be close to:
(A) 50000 (B) 10000
(C) 1000 (D) 5000
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