Given below are two statements:
| Assertion (A): |
Two straight current-carrying conductors A and B are lying in a vertical plane as shown. The separation between them is h and mass per unit length is \(𝜆 .\) Keeping \(A\) fixed, when \(B\) is raised by a small height \(dh,\) the net work done by external force per unit length will be \(𝜆 gdh.\)

|
| Reason (R): |
The work done by the magnetic field during this process is non-zero. |
| 1. |
Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. |
Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. |
(A) is True but (R) is False. |
| 4. |
(A) is False but (R) is True. |