Question

Two short bar magnets each of magnetic moment $M$ are placed as shown in the figure. The magnetic field at the point $P$ will be

• A. $\frac{{\mu }_0}{4\pi }\frac{2\sqrt{2}M}{d^3}$ towards right
• B. $\frac{{\mu }_0}{4\pi }\frac{2\sqrt{2}M}{d^3}$ towards left
• C. $\frac{{\mu }_0}{4\pi }\frac{2M}{d^3}$ towards right
• D. $\frac{{\mu }_0}{4\pi }\frac{2M}{d^3}$ towards left

Answer 1

The correct option is D $\frac{{\mu }_0}{4\pi }\frac{2M}{d^3}$ towards left

Magnetic field at point $P$ :-
$B=\left[\frac{{\mu }_{0}2M}{4\pi d^3}\right]\cos {60}^{\circ }\times 2$
$B=\left[\frac{{\mu }_0}{4\pi }\right]\left[\frac{2M}{d^3}\right]$ towards left.