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The flux linked with a coil at any insta...

The flux linked with a coil at any instant t is given by `Phi_(B)=10t^(2)-50t^(2)-50t+250.` The induced emf at t = 3s is

A

`-190 V`

B

`-10 V`

C

`10 V`

D

`190 V`

Text Solution

Verified by Experts

The correct Answer is:
B
`phi_B=10t^(2)-50t+250`
` e=-(dphi_(B))/dt`
`=d/dt(10t^(2)-50+250)`
`=-(20t-50)`
when `t = 3s" " e= -[(20times3)-50]`
`=-[(20times3)-50]`
`=-10V`
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