Question

Two magnetic poles one of which is four times as strong as other exert a force of 64 MG weight when placed 10 cm apart in a strength of poles are

Answer 1

Answer:

When two magnetic poles one of which is four times greater than the other in pole strength, are placed 5 cm apart in air. They exert a mutual force of 144 mg.wt. on each other. The pole strengths of the poles are (in ampere metre)

(g=10 m/s2)

A .

6, 3

B .

9, 3

C .

12, 3

D .

18,6

ANSWER

Letm1=4m2

F=4πμ0r2m1m2=10−7×4m22/(0.05)2=144×10−5

⇒4m22=1.44×25

∴m2=3Am,m1=12Am

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