Question

Magnetic field strength due to short bar magnet on its axial line at a distance $x$ is $B$. What is its value at the same distance on the equatorial line?

• A. $4B$
• B. $0.5B$
• C. $B$
• D. $2B$

Answer 1

Answer: (B)

$0.5B$

The magnetic field at any axial point is given by B = $\frac{2{\mu }_o}{4\pi x^3}$
Similarly, field at any equatorial point is given by, B = $\frac{{\mu }_o}{4\pi x^3}$
Thus, field at any equatorial point is half of what it is at an axial point.