Physics · Magnetic Effects of Current

A straight wire of length l carries a current I. When it is bent into a circular loop of a single turn, the magnetic field at its centre is B. If it is bent into a circular loop of two turns, the magnetic field at its centre is B 1 . Which of the following relations is correct?

Verified Solution4 OptionsUpdated: October 2026👁️1 View

1B 1 = 4B✓
2B 1 = B
3B 1 = B/2
4B 1 = B/4

Correct answer

B 1 = 4B

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A straight wire of length l carries a current I. When it is bent into a circular loop of a single turn, the magnetic field at its centre is B. If it is bent into a circular loop of two turns, the magnetic field at its centre is B 1 . Which of the following relations is correct?

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A straight wire of length l carries a current I. When it is bent into a circular loop of a single turn, the magnetic field at its centre is B. If it is bent into a circular loop of two turns, the magnetic field at its centre is B 1 . Which of the following relations is correct?

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