A circular loop of radius R carrying current I produces magnetic field B₀ at its centre. If its radius is doubled without changing the current, what is the new field?
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A circular loop of radius R carrying current I produces magnetic field B₀ at its centre. If its radius is doubled without changing the current, what is the new field?

G1 Physics · Accepted Answer

For one circular loop, B=μ₀I/(2R), so doubling R halves the field.