Two identical coils are parallel to each other on the same axis. They are separa

Question

Two identical coils are parallel to each other on the same axis. They are separated by a distance

equal to their radius (so called Helmholtz coils). They each have N turns and carry equal currents

I in the same direction. Find an expression for the magnetic field strength at the mid-point

between the loops. Calculate the field strength if the loops have 100 loops of wire,

15mm in diameter, and carry 100mA current.

Calculate equivalent resistance of the circuit in the picture (between points A

and B).

Explanation / Answer

let these coils are separated by a distance of a

then at a distance of a/2,

Bnet = 4 u0 n i /(5 sqrt5 a)

b. Bnet = 4*4pi*10^-7 * 0.1/(5* 2.23 * 0.0075)

Bnet = 6 micro tesla

for resistance fig in not found

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