For a point on the axial line of an ideal magnetic dipole at a distance that is much…

PHYSICS · Single correct · CBSE · Physics · Moving Charges and Magnetism · Moving Charges and Magnetism

Problem

For a point on the axial line of an ideal magnetic dipole at a distance

r

that is much larger than the size of the dipole, the magnitude

B

of the magnetic field most closely varies with

r

according to which proportionality? (a)

B\propto\dfrac{1}{r^{2}}

(b)

B\propto\dfrac{1}{r^{3}}

(c)

B\propto\dfrac{1}{r}

(d)

B\propto\dfrac{1}{r^{4}}