Question

a force acting on a magnetic pole of $0.07Am$ is $31.5N$. the magnetic field at that point is

• A. $450$
• B. $400$
• C. $350$
• D. $300$

Answer 1

The correct option is A $450$

Given,

$F=31.5N$

$M=0.07Am$

The force acting on a magnetic pole is given by

$F=MB$

$B=\frac{F}{M}$

$B=\frac{31.5}{0.07}=450T$

The correct option is A.