# The magnetic flux linked with a coil is given by the equation- 8t^2+ 3t+5 . induced emf in coil at FOURTH second will be

1
by sargun1

2015-07-30T22:19:27+05:30

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Induced emf ξ = -

ξ = - d (8 t² + 3 t + 5) / d t
= - 16 t + 3
= -16 * 4 + 3 = - 61 Volts.

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so there is no role of the word fourth? i mean is there any difference between flux in FOUR seconds and flux at FOURTH second?
magnetic flux is an instantaneous quantity.. so you find it at t = 1, 2, 3, 3.4 sec.. like that... for finding emf induced, perhaps there is no meaningful use for adding flux over a duration of time..
instantaneous emf generated depends of rate of change of flux at a point of time only..
thanxx..