Question

The magnetic moment of a bar magnet is 2A m2. if the magnetic length of the bar magnet is 5 cm.calculate pole strength

Answer 1

Given ,

• Magnetic dipole moment (M) = 2 A-m²
• Length of bar magnet (2l) = 5 cm or 0.5 m

We know that , the magnetic dipole moment is given by

$\boxed{ \sf{\vec{M} = q_{m} \times 2l}}$

Where ,

$\sf q_{m}$

= Pole strength or Magnetic charge

Thus ,

$\sf \mapsto 2 = q_{m} \times 0.5 \\ \\\sf \mapsto q_{m} = \frac{2}{0.5} \\ \\\sf \mapsto q_{m} = 4 amp$

∴The pole strength of bar magnet is 4 amp