Magnetic field due to currentEasy
Question
The magnetic moment of current (i)carrying circular coil of radius (r) and number of turns (n) varies as :
Options
A.1/r2
B.1/r
C.r
D.r2
Solution
Magnetic moment of a coil of radius r carrying current i is equal to
m = iAn [A is area of the coil, x is no. of turns]
= niπr2
So, M ∝ r2
m = iAn [A is area of the coil, x is no. of turns]
= niπr2
So, M ∝ r2
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