A capacitor (without dielectric) is discharging through a r…

Physics Electrostatics Potential & Capacitance Capacitance MCQ (Single Correct)

A capacitor (without dielectric) is discharging through a resistor. At same instant a dielectric is inserted between the plates, then-

Just after the insertion of the dielectric, current will increase

Just after the insertion of the dielectric charge on capacitor will increase

Just after the insertion of the dielectric, energy stored in the capacitor will increase

After the insertion of the dielectric, time constant will increase

Text Solution

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The correct answer is:

Let the capacitance before insertion of dielectric be C and the resistance be R.

∴ q = q 0 and i =

Just after insertion of dielectric the capacitance increases.

The charge just after insertion of dielectric remains same, but the current decreases

⇒ and are false.

The energy stored in capacitor is , hence energy decreases.

⇒ is false.

The time constant is RC and hence increases.

⇒ is true.

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