A circuit consisting of a constant e.m.f. 'E', a self induction 'L' and a resistance 'R' is closed at t = 0. The relation between the current I in the circuit and time t is as shown by curve 'a' in the figure. When one or more of parameters E, R and L are changed, the curve 'b' is obtained. The steady state current is same in both the cases. Then it is possible that –
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(a, c)
I = 
(1 – e –t/t )
E and R is constant. τ = 
, if L increases then τ will increase hence the curve will shift towards right if E and R are halved then τ will increase hence the curve will shift towards right.
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