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.
B.
C.
D.

Answer

A, B

Explanation

charge as a function of time `q= q_(0) (1-e^(-t//tau))`. Electric current as a function of time `i=i_(0) e^(-t//tau)`