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Question -

Explain what would happen if in the capacitor given inExercise 2.8, a 3 mm thick mica sheet (of dielectric constant = 6) wereinserted between the plates,

(a) While the voltage supply remained connected.

(b) After the supply was disconnected.



Answer -

(a) Dielectric constant of the mica sheet, k =6

Initial capacitance, C =1.771 × 10−11 F

Supply voltage, = 100 V

Potential across the plates remains 100 V.

(b) Dielectric constant, k = 6

Initial capacitance, C =1.771 × 10−11 F

If supply voltage is removed, then there will be noeffect on the amount of charge in the plates.

Charge = 1.771 × 10−9 C

Potential across the plates is given by,

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