A long solenoid that has 1000 turns uniformly distributed over a length of 0.40 m produces a magnetic field of magnitude 1.0 x 10-4 T at its center to the right. Determine the direction of the current and what current is required in the windings for that to occur?
direction of current must be to the left
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B = uo N i /L
10^-4 = 4* 3.14* 10^-7* 1000* i / 0.4
i = 0.03185 A
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