A particle having a charge of 100 mu C a...

A particle having a charge of `100 mu C` and a mass of 10mg is projected in a uniform magnetic field of 25m T with a speed of `10ms^(-1)`. If the velocity is perpendicular to the magnetic field , how long will it take for the particle to come back to its original position for the first time after being projected.

4cm, 25sec

4m, 25 millisec

4cm, `25 xx 10^(-3)` sec

4m, 25sec

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