A coil in the form of a circle of radius r has EMF of ε. What can you say about the EMF if the coil is now changed to a square?
Answer & explanation
Correct answer: option 2
Hint : Length of the coil remains the same.
2πr = 4a ; a : side of the square
a = \(\frac{πr}{2}\)
a2 = (\(\frac{πr}{2}\) )2