A) directly proportional to r
B) inversely proportional to r
C) directly proportional to \[{{r}^{2}}\]
D) inversely proportional to \[{{r}^{2}}\]
Correct Answer: B
Solution :
Magnetic field at the centre of a coil of radius r, having N turns carrying current i is given by \[B=\frac{{{\mu }_{0}}Ni}{2r}N{{A}^{-1}}{{m}^{-1}}\] The direction of magnetic field is perpendicular to the plane of the coil, that is, along the aixis of the coil. Hence, magnetic field is inversely proportional to r.
You need to login to perform this action.
You will be redirected in
3 sec
