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23. The force between the plates of a parallel plate capacitor of capacitance C and distance of separation of the plates d with a

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23. The force between the plates of a parallel plate capacitor of capacitance C and distance of separation of the plates d with a potential difference V between the plates is :- (1) CV/2d (3) Cv/d (2) Cv/2d (4) Vd/C 24. In the circuit shown charge on 2uF capacitor is : 2F 120V 4F 1F (1) 160 C (2) 80 C (3) 40 C (4) 20 C 25. Three capacitors each of capacitance C and of breakdown voltage V are joined in series. The capacitance and breakdown voltage of the combination will be: (1) 3C, 3V (2) C V 3'3 >3 V (3) 3C, (4), 3V 26. Mean electric energy density between the plates of a charged capacitor is (Here q = Charge on capacitor; A = Area of each plate of the capacitor) (2) q/(2,A) (1) q/(2,A) (3) q/(2,A) (4) None of these

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