Figure. shows two concentric coplanar coils with radii `a` and `b(alt ltb)`. A current `I = 2t` flows in the smaller loop. Neglecting self-inductance of the larger loop, if a capacitor of capacitance `C` is also connected in the larger loop as shows in Fig . , find the charge on the capacitor as a function of time.

Explanation

`q = C varepsilon(1 - e^(-t//RC))` where `varepsilon = (mu_(0)pia^(2))/(b)*`