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A thin strip 10 cm long is on a U shaped wire of negligible resistance and it is connect to a spring of spring constant (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
and air drag negligible, N will be close to :
10000
1000
5000
50000
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for
No. of oscillations =
Option 1)
10000
Option 2)1000
Option 3)5000
Option 4)50000