First slide

Magnetic flux and induced emf

Question

The magnetic flux linked with a coil is given by an equation $ϕ$ (in webers) = $8 t^{2} + 3 t + 5$ . The induced e.m.f. in the coil at the four seconds will be

Moderate

A

16 units
B

39 units
C

67 units
D

145 units

Solution

$e = - \frac{dϕ}{dt} = - (16 t + 3) = - 67 units$

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