Problem a solenoid of radius 10 m with 770 turns and a, Ask an Expert

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Problem: A solenoid of radius 1.0 m with 770 turns and a length of 4.9 m surround a pigeon cage.

1. What current must be in the solenoid so that the solenoid field just cancels Earth's 4.2 × 10⁵ T magnetic field (used occasionally by the pigeons to determine the direction they travel)?

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