Two coils carrying current in opposite direction are placed co- axially with centres at some finite separation. If they are brought close to each other then, current flowing in them should

Options

A. decrease
B. increase
C. remain same
D. become zero

Explanation

To solve the problem regarding the behavior of two coils carrying current in opposite directions when brought close to each other, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Configuration**:
- We have two coils that are coaxially aligned, meaning they share the same central axis.
- The currents in these coils are flowing in opposite directions.

2. **Identify the Magnetic Fields**:
- According to the right-hand thumb rule, if the current in the first coil flows in one direction, it creates a magnetic field with a north pole on one end and a south pole on the other.
- For the second coil, since the current flows in the opposite direction, it will have its north and south poles reversed compared to the first coil.

3. **Determine the Interaction**:
- Since the two coils have opposite currents, they will produce magnetic fields with opposite poles facing each other when brought close together.
- This results in like poles (north-north or south-south) being brought together, which leads to a repulsive force between the coils.

4. **Effect on Current**:
- As the coils are brought closer, the repulsive force between them increases.
- To maintain the current flow against this increasing repulsion, the current in each coil must increase to overcome the repulsive magnetic forces.

5. **Conclusion**:
- Therefore, when the two coils are brought close to each other, the current flowing in them should **increase**.

### Final Answer:
The current flowing in the coils should **increase** when they are brought close to each other.

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