What is happens to the force between magnetic poles when their pole strenght and the distance between them both gets doubled ?

Answer

B

Explanation

Let pole strength be `m_(1) and m_(2)` and distance between them is r, then force between magnetic poles, `Falpha (m_(1)m_(2))/(r^(2))`
In second case, `F alpha ((2m_(1))(2m_(2)))/(2r^(2)), alpha=(m_(1)m_(2))/(r)`