A ball of mass 2 xx 10^(-3) kg carries a...

A ball of mass `2 xx 10^(-3)` kg carries a charge of `2 xx 10^(-8)` C. This ball is given an initial horizontal velocity of `5 xx 10^(4) ms^(-1)` in the earth's gravitational field. What is the magnetic field required to keep the ball moving without deflection ?
[Hint : `F_(m)` (magnetic force) `=q_(0)vB "sin"theta=omegag`]

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