A parallel-plate capacitor has a plate area of 0.3 m² and a plate separation of 0.1 mm. If the charge on each plate has a magnitude of 5 × 10⁻⁶ C then the force exerted by one plate on the other has a magnitude of about :
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Question

A parallel-plate capacitor has a plate area of 0.3 m² and a plate separation of 0.1 mm. If the charge on each plate has a magnitude of 5 × 10⁻⁶ C then the force exerted by one plate on the other has a magnitude of about :

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G1 Physics · Accepted Answer

Use Q = CV, U = ½CV² and C = εA/d; reduce the capacitor network by series/parallel combination and apply charge conservation where a node is isolated. The result matches B (5 N).