Question

The geometric length of a bar magnet having half magnetic length 5cm _____ cm.
a) 12
b) 10
c) 6
d) 4.2

Answer 1

Answer:

Geometric length: Geometric length is the measure of total length of magnet. A bar magnet consist of two equal and opposite magnetic pole separated by a small distance. Poles are not exactly at the ends. The shortest distance between two poles is called effective length and is less than its geometric length.

Magnetic length = 0.84 * geometric length

Geometric length = 2*5/0.84 = 11.905 cm

Hope this helps.