Question

The magnetic length of a bar magnet is 10 cm then its geometric length is :

• A. 10 cm
• B. 12 cm
• C. 5 cm
• D. 6 cm

Answer 1

The correct option is B 12 cm

$Given:$ Magnetic length of a bar magnet $=10cm$

$Solution:$ We know that the magnetic length is equivalent to $5/6$ th of geometric length.

- Thus, Magnetic length $=5/6$ (geometric length)

$10=5/6$ (geometric length)

$10\times \left(6/5\right)=\text{geometric length}$

$12=$ geometric length

Thus, the geometric length is $12cm.$

$So,the$ $correct$ $option:B$