(Answered) A solenoid of radius 10 m with 800 turns and a length of 49

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A solenoid of radius 1.0 m with 800 turns and a length of 4.9 m surrounds a pigeon cage. Part A What current must be in the solenoid so that the solenoid field just cancels Earth's 4.2 × 10-5-T magnetic field (used occasionally by the pigeons to determine the direction they travel)?

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