Question: Full question: 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

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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

Full question: A point charge q=2?10?7q=2?10?7 C is placed at the center

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