Mathematics · Magnetic Effects of Current
A coil having N turns is wound tightly in the form of a flat spiral with inner and outer radii a and b respectively. Find the magnetic field at the centre when a current I passes through the coil:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1μ0 I N2(b - a) loge(ba)✓
- 2μ0 I8 (a - ba + b)
- 3μ0 I4(a - b) [1a - 1b]
- 4μ0 I8 a + ba - b
Correct answer
μ0 I N2(b - a) loge(ba)
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