The ratio of magnetic fields on the axial line of a long magnet at distances of 10 cm and 20 cm is 12.5: 1 . The length of the magnet is

Question

The ratio of magnetic fields on the axial line of a long magnet at distances of 10 cm and 20 cm is 12.5: 1 . The length of the magnet is (A) 5 cm (B) 10 cm (C) 10 m (D) 15 m

Tardigrade Admin · Accepted Answer

B text axial =(μ0/4 π) (2 Md /( d 2-12)2)

Q. The ratio of magnetic fields on the axial line of a long magnet at distances of $10 c m$ and $20 c m$ is $12.5 : 1.$ The length of the magnet is

$5 c m$

$10 c m$

$10 m$

$15 m$

$B_{axial} = \frac{μ _{0}}{4 π} \frac{2 M d}{( d ^{2} - 1 ^{2} ) ^{2}}$

Q. The ratio of magnetic fields on the axial line of a long magnet at distances of 10cm and 20cm is 12.5:1. The length of the magnet is

5cm

10cm

10m

15m