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Switch S is closed t=0, in the circuit s...

Switch `S` is closed `t=0`, in the circuit shown. The change in flux in the inductor `(L=500mH)` from `t=0` to an instant when it reaches steady state is

A

`2WB`

B

`1.5Wb`

C

`0Wb`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
B
Initial current `=10/10 =1A`
:. `phi_i=L(I_i)=500mWb=0.5Wb`
Final current `=20/5=4A`
`phi_f=L(I_f)=(0.5)xx4=2 Wb`
`:. /_\phi=1.5Wb`
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