A small square loop of wire of side l is placed inside a large square loop of wire of side l. The loops are coplanar and their centers coincide. What is the value of the mutual inductance of the system?
a) M = μ₀l²/4√2
b) M = μ₀l²/4√3
c) M = μ₀l²/2
d) M = μ₀l²
