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Though earth produces magnetic field why can’t a coil rotating in air induce current in it?

Though earth produces magnetic field why can’t a coil rotating in air induce current in it?

Grade:12th pass

1 Answers

Umakant biswal
5349 Points
6 years ago
DEAR 
earth magnetic field is too weak . it is typically 50 microtesla in magnitude , in comparison , atypical frige magnet are 5 millitesla strong , and the bar magnets are 1 tesla strong . 
you need such strong magnetic field to produce any significant amount of voltage in the coil rotating in air . 
HOPE IT CLEARS NOW 
regards 

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