Question

Magnetic induction due to magnetic monopole is inversely proportional to cube of distance of the point.

• A. True
• B. False

Answer 1

The correct option is B False

False.

Magnetic induction due to magnetic dipole is inversely proportional to cube of distance between them.

at axial point; magnetic field due to dipole = $\overrightarrow{B}$ = $\frac{\mu o}{4\pi }\frac{2\overrightarrow{m}}{r^3}$

At equatorial, point; magnetic field due to dipole = $\overrightarrow{B}$ = $\frac{-\mu o}{4\pi }\frac{\overrightarrow{m}}{r^3}$

$\mu o$ = Permeability = $4\pi \times {10}^{-7}TM{A}^{-1}$ .

$\overrightarrow{m}$ = magnetic dipole moment.

r = distance of point from mid point of dipole.

OPTION : B.