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The magnetic flux linked with a coil var...

The magnetic flux linked with a coil varies as `phi=3t^(2)+4t+9.` Find the magnitude of the emf induced at t = 2S.

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`phi=3t^2+4t+9`
`e=(dphi)/(dt)=d/(dt)(3t^2+4t+9)`
e=6t+4
At t=2s, e= `6 xx 2+4 = 16 V`.
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