a positive charge q of mass m is moving along the x axis.We wish to apply a uniform magnetic field B for time Δ t so that charge reverses its direction crossing the y axis at a distance d..Then what is the magnitude of B

for  the reverse direction it must complete semi circle.hence the radius of the path be r=d2speed v=πrt=πd2tr=mvBqB=mvrq=mπd2td2q=mπt.qRegards

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