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  

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