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The magnetic flux (in weber) linked with...

The magnetic flux (in weber) linked with a coil of resistance `10Omega` is varying with respect to time t as `phi=4t^(2)+2t+1`. Then the current in the coil at time `t=1` second is

A

a. 0.5 A

B

b. 2A

C

c. 1.5A

D

d. 1A

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