Question

A square frame of side a in a B - field is reshaped into a ring in T seconds. Find ${ϵ}_{ind}$.

• A. $\frac{B{a}^2}{T}(\frac{1}{\pi }-1)$
• B. $\frac{B{a}^2}{T}(\frac{4}{\pi }-\frac{1}{2})$
• C. $\frac{B{a}^2}{T}(\frac{4}{\pi }-1)$
• D. $\frac{B{a}^2}{T}(\frac{1}{\pi }-\frac{1}{2})$

Answer 1

The correct option is C $\frac{B{a}^2}{T}(\frac{4}{\pi }-1)$