Magnetic field due to currentHard
Question
A circular coil of radius R carries an electric current. the magnetic field due to the coil at a distance r from the centre of the coil, such that r > > R, varies as
Options
A.l/r
B.l/r3/2
C.l/r2
D.l/r3
Solution
Magnetic field on the axis of the coil is
B =
If x >> a
B =
or B ∝ 
B =
If x >> a
B =
or B ∝ Create a free account to view solution
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