Question

the magnetic flux through a coil perpendicular to its plane is varying according to the relation ø=(4t^3+5t^2+8t+7) weber.Calculate the induced current through the coil at t=2s, if the resistance of the coil is 3.1ohm
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Answer 1

Answer:

Answer

ϕ=(5t3+4t2+2t−5) Weber

time t=2 sec

Resistance =5Ω

induced emf E=dtdϕ

dtdϕ=15t2+8t+2

at t=2 sec,dtdϕ=15×4+8×2+2

                              =78 V

Also E=IR

E=78 V,R=5Ω

I=Rk=578=15.6 A

Answer 2

Answer:

question is wrong not magnetic flux that is magnetic