A rod of length `l` is kept parallel to a long wire carrying constant current `i` . It is moving away from the wire with a velocity `v`. Find the emf induced in the wire when its distance from the long wire is `x`.

Explanation

To find the emf induced in a rod of length \( l \) moving away from a long wire carrying a constant current \( i \), we can follow these steps:

### Step 1: Determine the Magnetic Field due to the Long Wire
The magnetic field \( B \) at a distance \( x \) from a long straight wire carrying a current \( i \) is given by the formula:
\[ B = \frac{\mu_0 i}{2 \pi x} \]
where \( \mu_0 \) is the permeability of free space.
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