A circuit consists of a source of a constant `emf xi` and a resistance `R` amd a capacitor with capacitance `C` connected in series. The internal resistance of the source is negligible. At a moment `t = 0` the capacitance of the capacitor is abruply decreased `eta`-fold. FInd the current flowing through the circuit as a function of time `t`.

Options

A. `(E)/(R)(eta-1)e^((eta t)/(CR))`
B. `(E)/(R)(eta-1)e^((t)/(CR))`
C. `(E)/(R)(eta-1)(1-e^(-(etat)/(CR)))`
D. `(E)/(R)(eta-1)(1-e^(-(t)/(CR)))`

Answer

A

Explanation

Magnitude for on the slab is constant, which is
`F=(in_(0)b V^(2)(K-1))/(2d)`.