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A coil o finductanc e8.4mH and resistanc...

A coil o finductanc e`8.4mH` and resistance `6Omega` is connected to a `12V` battery. The current in the coil is 1.0A` in the time (approx .)

A

`500sec`

B

`20sec`

C

`35msec`

D

`1msec`

Text Solution

Verified by Experts

The correct Answer is:
D
`i=(E)/(R)(1-e^(-(Rt)/(L)))`
`i=(12)/(6)[1-e^(-(6xxt)/(8.4xx10))]`
`(t)/(e^(1.4xx10^(-3)))=2`
`(t)/(1.4xx10^(-3))=1n2=0.7`
`t=0.98xx10^(-3)=1msec`
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Knowledge Check

  • A coil of inductance 8.4 mH and resistance 6 Omega is connected to a 12 V battery. The current in the coil is 1.0 A at approximately the time.

    A
    `500`sec
    B
    `20` sec
    C
    `35` millisec
    D
    `1` millisec

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    D
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  • A coil of inductance 8.4 mH and resistance 6 omega is connected to 12 V battery. The current in the coil is 1 A at approximately the time

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