When the north pole of a magnet is moved away from a coil, what is the direction of current induced in a coil?

Answer

To determine the direction of the induced current in a coil when the north pole of a magnet is moved away from it, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Initial Setup**:
- We have a coil and a magnet. The north pole of the magnet is positioned near the coil and is being moved away from it.

2. **Understand Magnetic Flux**:
- The magnetic field lines emerge from the north pole and enter the south pole of the magnet. When the north pole is moved away from the coil, the magnetic field strength through the coil decreases.

3. **Apply Faraday's Law of Electromagnetic Induction**:
- According to Faraday's Law, a change in magnetic flux through the coil induces an electromotive force (EMF) in the coil. In this case, as the north pole moves away, the magnetic flux through the coil is decreasing.

4. **Use Lenz's Law**:
- Lenz's Law states that the direction of the induced current will be such that it opposes the change in magnetic flux. Since the magnetic field is decreasing (as the north pole moves away), the induced current will flow in a direction that tries to maintain the magnetic field inside the coil.

5. **Determine the Direction of Induced Current**:
- To oppose the decrease in magnetic field, the coil will generate its own magnetic field in the same direction as the original magnetic field (which is from the north pole of the magnet). Therefore, the induced current must flow in a direction that creates a north pole facing the magnet's north pole.

6. **Use the Right-Hand Rule**:
- According to the right-hand thumb rule, if you point your thumb in the direction of the magnetic field (which is towards the north pole), your fingers will curl in the direction of the induced current. Since we want to create a north pole to oppose the moving north pole, the current must flow in an anticlockwise direction when viewed from the north pole of the magnet.

7. **Conclusion**:
- Therefore, the direction of the induced current in the coil, when viewed from the north pole of the magnet, is anticlockwise.