Physics · Moving Charges and Magnetism
The fractional decrease in the magnetic field intensity at a distance r from the center on the axis of a current-carrying circular coil of radius a compared to the magnetic field intensity at the center of the same coil is given by (where r << a):
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 123 a2r2
- 232 a2r2
- 332 r2a2✓
- 423 r2a2
Correct answer
32 r2a2
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