Q.

The magnetic flux linked with a coil is given by an equation ϕ  (in webers) =  8t2+3t+5. The induced e.m.f. in the coil at the four seconds will be

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a

16 units

b

39 units

c

67 units

d

145 units

answer is C.

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Detailed Solution

e=−dϕdt=−(16t+3)=−67 units
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The magnetic flux linked with a coil is given by an equation ϕ  (in webers) =  8t2+3t+5. The induced e.m.f. in the coil at the four seconds will be