Physics · 2018
JEE Main · 15 April 2018, Shift 1 · Q18
A Helmholtz coil has a pair of loops, each with N turns and radius R. They are placed coaxially at distance R and the same current I flows through…
A Helmholtz coil has a pair of loops, each with N turns and radius R. They are placed coaxially at distance R and the same current I flows through the loops in the same direction. The magnitude of magnetic field at P, midway between the centres A and C, is given by [Refer to figure given below] :
Official answer
(2)
$\displaystyle \frac{8 \mathrm{~N} \mu_0 \mathrm{I}}{5^{3 / 2} \mathrm{R}}$
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JEE Main 2018 Physics question, with the answer from NTA’s final answer key. Where our answers come from.