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The magnetic flux through a coil varies ...

The magnetic flux through a coil varies with time as `phi=5t-6t+9.` The ratio of E.M.F. at `t=0s" to "t=0.5s` will be

A

`9:1`

B

`1:6`

C

`6:1`

D

`1:9`

Text Solution

Verified by Experts

The correct Answer is:
C
`E=-(d phi)/(dt)`
`E=-d/(dt)(5t^(2)-6t+9)`
`E=6-10t`
`t=0s,E(0)=6-0=6V`
`t=0.5sE(0.5)=6-5=1V`
`(E(0))/(E(0.5))=6/1`
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