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Asked in GSEB Board July 2021 · Rotating charges and multiple loops
Given: N=100 turns, R=10 cm=0.1 m, I=1 A.
Idea: at the centre of a circular coil of N turns every element of the wire is the same distance R away and contributes in the same direction, giving B=(μ₀NI)/(2R).
B=(4π×10⁻⁷×100×1)/(2×0.1)
Top: 4π×10⁻⁵. Bottom: 0.2.
B=2π×10⁻⁴ T, which is about 6.3×10⁻⁴ T.
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