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Plate A of parallel plate air filled cap...

Plate A of parallel plate air filled capacitor is connected to a spring having force constant k and plate B is fixed. They are held on a frictionless table top as shown in Fig. If charge `+q` is placed on plate A and a charge `-q` on plate A and a charge `-q` on plate B, by how much does the spring expand ?

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The correct Answer is:
`(q^(2))/(2k in_(0)A)`
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RESONANCE-CAPACITANCE-Exercise - 1
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