Question

Two similar bar Magnets $P$ and $Q$ each of magnetic moment $M$ are taken. If $P$ is cut along its axial line and $Q$ along its equatorial line all the four pieces obtained have each of

• A. Equal pole strength
• B. Magnetic moment$\frac{M}{4}$
• C. Magnetic moment$\frac{M}{2}$
• D. Magnetic Moment $M$

Answer 1

Answer: (C)

Magnetic moment$\frac{M}{2}$

For P,
New pole strength$=P/2$
${\mu }_1=\frac{m}{2}$
For Q, New length $=L/2$
$\therefore {\mu }_2=\frac{m}{2}$
${\mu }_1={\mu }_2=\frac{m}{2}$