What is the mutual inductance of a two-loop system as shown with centre separation l
μ0πa48l3
μ0πa44l3
μ0πa46l3
μ0πa42l3
Magnetic field at the location of coil (2) produced due to coil (1)
B1=μo4π.2Ml3
Flux linked with coil (2)
ϕ2=B1A2=μo4π2i (πa2)l3×(πa2)
Also ϕ2=Mi⇒M=μoπa42l3