Question
charge flowing thru a xsection of wire varies with time as q= 2te-kt , where k is const . the voltmeter reads zero at t=??
Joshi sir comment
q= 2te-kt
on differentiating with respect to t, we get
dq/dt = 2[t(-k)e-kt + e-kt ]
so for V = 0, i will be 0
so t = 1/k