Question

A parallel plate condenser is connected to a battery of emf 4 volt. If a plate of dielectric constant 8 is inserted into it, the potential difference on the condenser will be :

• A. 32 V
• B. 4 V
• C. 1/2 V
• D. 2 V

Answer 1

Answer: (B)

4 V

Total charged is conserved in the condenser. Here the potential difference on the condenser is equal to the emf of battery. When dielectric is inserted between the plates the charge will maintain the constant potential in the capacitor. Thus, the potential difference on the condenser is $4V$