Q. What happens to the force between magnetic poles when their pole strength and the distance between them are both doubled

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A

Force increases to two times the previous value

7%

B

No change

71%

C

Force decreases to half the previous value

14%

D

Force increases to four times the previous value

7%

Solution:

$F \propto \frac{m _{1} m _{2}}{r ^{2}}$