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A point charge q=2?10?7q=2?10?7 C is placed at the center of a spherical cavity of radius 3 cm in a metal piece. Points a and b are situated at distances 1.5 cm and 4.5 cm respectively from the center of cavity. The electric field intensities at a and b are

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When q charge is placed at the center of the spherical cavity then an equal and opposite c... View the full answer