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The magnetic flux through a coil varies ...

The magnetic flux through a coil varies with time as `phi=5t^2+6t+9` The ratio of emf at t = 3 s to t = 0 s will be

A

`1:9`

B

`1:6`

C

`6:1`

D

`9:1`

Text Solution

Verified by Experts

The correct Answer is:
`3`
`(dphi)/(dt)=10t+6Rightarrowe=-(dphi)/(dt)=-(10t+6)`
`e_(t-3)=-(10xx3+6)=-36Rightarrow e_(t-0)=-(10xx6+6)=-6`
`(e_(t-3)/e_(t-0)=(-36)/(-6)=(6)/(1)`
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