A coil of inductance 0.2 H and 1.0 W resistance is connected to a 90 V source. At what rate will the current in the coil grow at the instant the coil is connected to the source?

Options

A. `450As^(-1)`
B. `4.5As^(-1)`
C. `45As^(-1)`
D. `0.45As^(-1)`

Answer

A

Explanation

From `e=L" dl/dt"`
`(dl)/(dt)=(e)/(L)=(90)/(0.2)=450As^(-1)`