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Magnetic flux phi (in weber) linked with...

Magnetic flux `phi` (in weber) linked with a closed circuit of resistance `10 ohm` varies with time `t` (in seconds) as
`phi=5t^(2)-4t+1`
The induced electromotive force in the circuit at `t=0.2` sec is

A

`-40 V`

B

`40 V`

C

`140 V`

D

`300 V`

Text Solution

Verified by Experts

The correct Answer is:
B
`e=-(dvarphi)/(dt)=-(d)/(dt)(5t^(3)-100t+300)=-(15t^(2)-100)`
at `t=2sec , e=40 V`
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A2Z-ELECTROMAGNETIC INDUCTION-Section D - Chapter End Test
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