Teaching OSSTET Mock Test 2023 Physics Moving Charges and Magnetism Magnetic Field

A 50 cm long solenoid has winding of 400 turns. What current must pass through it to produce a magnetic field of induction 4π × 10−3 T at the center ?

1
10.5 A
2
12.5 A
3
25.0 A
4
20.0 A
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