Multiple choice

An air capacitor C, is connected to a battery of emf V. It acquires a charge Q and energy E. The capacitor is then disconnected from the battery and a dielectric slab is introduced between the plates. Which of the following is true?

  1. The values of Q and C increase but values of V and E decrease.

  2. The values of V and Q decrease but values of E and C increase.

  3. V remains unchanged but the values of Q, E and C increase.

  4. Q remains unchanged, C increases and the values of V and E decrease.

  5. The values of Q, C, V and E, increase.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The charge remains the same. Capacitance increases. Hence, the potential V = q/C decreases and the energy E = 1/2(q2/C).

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