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Q.

A coil of resistance 400 Ω is placed in a magnetic field. If the magnetic flux ϕ (Wb) linked with the coil varies with time t (sec) as

                          ϕ = 50 t2 + 4

The current in the coil at t = 2 sec is :

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a

2 A

b

1 A

c

0.5 A

d

0.1 A

answer is C.

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Detailed Solution

detailed_solution_thumbnail

I=dϕ/dtR=100 t400=200400=0.5 A

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A coil of resistance 400 Ω is placed in a magnetic field. If the magnetic flux ϕ (Wb) linked with the coil varies with time t (sec) as                          ϕ = 50 t2 + 4The current in the coil at t = 2 sec is :