1.

A rod of length `1m` rotates about one of its end points with an angular velocity `2 rad//sec` in a plane perpendicular to the magnetic field `B=2T` as shown in the figure. Then find magnitude of electric field (in `SI` unit) at the mid point of the rod.

Answer» For a charge to be in equlibirum,
`qE=qvBrArrE=omegaLB//2=BL omega//2=2`


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