railway RRB JE (CBT I + CBT II) Mock Test 2024 Electromagnetic Theory

A toroidal coil has a magnetic path length of 30 cm and a magnetic field strength of 750 A/m. The coil current is 250 mA. Determine the number of coil turns.

1
900 turns
2
800 turns 
3
750 turns
4
625 turns 
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