Question

A bar magnet has magnetic moment 3.6 Am² and pole strength 10.8 Am. Determine its magnetic length and geometric length.

Answer 1

Given: m = 3.6 Am², q_m = 10.8 Am

To find:

i. Magnetic length 

ii. Geometric length

Formulae:

i. Magnetic length = \(\frac{m}{q_m}\)

ii. Geometric length = \(\frac{6}{5}\) × magnetic length.

Calculation: From formula (i),

Magnetic length = \(\frac{3.6}{10.8}\) = 0.33 m

From formula (ii),

Geometric length = \(\frac{6}{5}\) × 0.33

= 0.396 m ≈ 0.4 m