How much current is flowing when a magnet is kept stationary inside a solenoid?

Options

A. 1A
B. 10A
C. 0.1A
D. 0A

Explanation

To determine how much current is flowing when a magnet is kept stationary inside a solenoid, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Situation**:
- We have a solenoid and a magnet. The magnet is placed inside the solenoid and is kept stationary.

2. **Definition of Stationary**:
- "Stationary" means that the magnet is not moving. It is at rest relative to the solenoid.

3. **Relative Motion**:
- In electromagnetic induction, a change in magnetic flux through a circuit is necessary to induce current. Since the magnet is stationary, there is no relative motion between the magnet and the solenoid.

4. **Change in Magnetic Flux**:
- When the magnet is stationary, there is no change in the magnetic field lines passing through the solenoid. Therefore, the magnetic flux through the solenoid remains constant.

5. **Induced Current**:
- According to Faraday's law of electromagnetic induction, an induced current is produced only when there is a change in magnetic flux. Since there is no change in flux (due to the stationary position of the magnet), no current will be induced in the solenoid.

6. **Conclusion**:
- As a result, the current flowing in the solenoid when the magnet is stationary is **0 amperes**.

### Final Answer:
The current flowing when a magnet is kept stationary inside a solenoid is **0 amperes**.

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