A small square loop of side 'a' and one turn is placed inside a larger square loop of side b and one turn (b > > a). The two loops are coplanar with their centres coinciding. If a current I is passed in the square loop of side 'b', then the coefficient of mutual inductance between the two loops is:___
o μ₀/4π 8 2b/a²
o μ₀/4π 8 2/b
o μ₀/4π 8 2/b
o μ₀/4π8 2 a²/a