Question

In which of the following cases, an electric current flows through a conductor?

• A. When zero potential difference is applied across it
• B. When a battery is connected to it in a closed circuit
• C. When a battery is connected to it in an open circuit
• D. When a potential difference is applied accross it in a closed circuit

Answer 1

Answer: (B), (D)

The correct options are
B When a battery is connected to it in a closed circuit
D When a potential difference is applied accross it in a closed circuit

When a potential difference is applied across the ends of the conductor, then electrons tend to flow through it which constitutes an electric current. This is achieved only when the electrical circuit is closed. The battery is a device which helps in applying the potential difference across the ends of a conductor.