Question

A capacitor is charged with a battery. The battery is then disconnected and a piece of...

A capacitor is charged with a battery. The battery is then disconnected and a piece of insulating material is inserted between the two plates. Which of the following is true?

A. The E-field in the capacitor increases as the capacitance increases

B. The E-field in the capacitor increases as the capacitance decrease

C. The E-field in the capacitor decreases as the capacitance increases

C. The E-field in the capacitor decreases as the capacitance decreases

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Answer #1

As insulating material is inserted between plates then it will behave as dielectric and it will get polarised and electric field is reduced between the plates.

This field reduce potential for same charge on plates hence increases capacitance.

Option c is correct

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