A parallel plate capacitor is first charged and then isolated , and a dielectric slab is introduced between the plates. The quantity that remains unchanged is:
charge Q
potential V
capacity C
energy U
A
charge Q
B
potential V
C
capacity C
D
energy U
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Solution
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When the capacitor is kept at a voltage, it gains charge. Now when the system is isolated, the charge present on capacitor cannot change because of law of conservation of charge. ∴ Charge always remains constant in isolated systems.
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