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A positive charge ' q ' of mass ' m ' is moving along the +x axis .We wish to apply a uniform magnetic field B for time Δt so that the charge reverses its direction crossing the y- axis at a distance d . Then :

(a)B=mvqdandΔt=πdv(b)B=mv2qdandΔt=πd2v(c)B=2mvqdandΔt=πd2v(d)B=2mvqdandΔt=πdv

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