A wire in the form of a circular loop of radius `10 cm` lies in a plane normal to a magnetic field of `100 T`. If this wire is pulled to take a square shape in the same plane in `0.1 s`, find the average induced emf in the loop.

Explanation

To solve the problem of finding the average induced emf in the loop, we can follow these steps:

### Step 1: Calculate the initial area of the circular loop
The area \( A \) of a circular loop is given by the formula:
\[ A = \pi r^2 \]
where \( r \) is the radius of the loop. Given that the radius \( r = 10 \, \text{cm} = 0.1 \, \text{m} \):
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