Series combination of 10`Omega` resistance and 5 cm long solenoid having 5 mH self inductance are connected to 10 V battery. Current passing through solenoid in steady state is ___

Options

A. 5A
B. `1A`
C. `2A`
D. zero

Answer

B

Explanation

In the present case, we have the formula ,
`I=I_0 (1-e^(-Rt//L))`
`=I_0(1-1/e^(Rt//L))`
Theoretically , steady state is reached when `t to oo` . At this time `I to I_0`.
But `I_0=V/R=10/10`=1A