Question

Two magnetic poles, one of the which is 4 times
as strong as the other, exert on each other a force
equal to 1 milli Newton when separated by a
distance of 0.1m. Calculate the strength of each
pole.​

Answer 1

Hey Dear,

◆ Answer -

m1 = 5 A.m

m2 = 20 A.m

● Explaination -

# Given -

F = 1 mN = 10^-3 N

r = 0.1 m

m2 = 4m1

# Solution -

According to Coulomb's law -

F = (μ/4π) m1.m2/r^2

10^-3 = 10^-7 × m1.m2 / 0.1^2

m1.m2 = 10^-3 × 10^-2 / 10^-7

m1.m2 = 100

Given that m2 = 4m1,

m1 × 4m1 = 100

m1^2 = 100/4

m1^2 = 25

m1 = 5 A.m

Now,

m2 = 4m1

m2 = 4×5

m2 = 20 A.m

Therefore, strength of one pole is 5 Am and other pole is 20 Am.

Hope this helps you...