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A point charge Q(=3xx10^(-12)C) rotates ...

A point charge `Q(=3xx10^(-12)C)` rotates uniformly in a vertical circle of radius R =1 mm. The axis of the circle is aligned along the magnetic axis of the earth. At what value of the angular speed `omega`, the effective magnetic field at the center of the circle will be reduced to zero ? (Horizontal component of Earth's magnetic field is 30 micro Tesla)

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