Question

The instantaneous magnetic flux in a circuit is  `phi=4t^2-4t+1`. The total resistance of circuit is 15 Ω. At t = 2s, the induced current in circuit is ____________.

Options

• 0.8 A

• 0.6 A

• 0.4 A

• 0.2 A

Answer 1

The instantaneous magnetic flux in a circuit is  `phi=4t^2-4t+1`. The total resistance of circuit is 15 Ω. At t = 2s, the induced current in circuit is 0.8 A.

Explanation:

`I = "e"/"R"= (((dphi)/dt))/"R" = 1/"R" d/dt (4t^2-4t+1)`

`therefore I = (8t − 4)/"R"= (8 xx 2 - 4)/15` = 0.8