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A coil of resistance 400 `Omega` is placed in magnetic field. If the magnetic flux `phi`(Wb) linked with the coil varies with time t(s) as `phi= 50t^2 + 4` . The current in the coil at t = 2 s is
A. |
0.5 A |
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B. |
0.1 A |
C. |
2 A |
D. |
1 A |