The force of attraction between two point magnetic poles is directly proportional to the product of their pole strengths and inversely proportional to the square of the distance between them. i.e. `F prop (m_(1)m_(2))/(d^(2)) rArr F= (Km_(1)m_(2))/(d^(2))`. Where K is a constant, `m_(1) and m_(2)` are pole strengths and 'd' is the distance between them. This is called Coulomb's law Using the above information, answer the following questions.
The force between two poles `(m_(1) and m_(2))` in air which are separated by a distance 'd' is F. If `m_(1)` is halved and `m_(2)` is doubled and the distance is same i.e., d, the force now is ____

Options

A. F
B. `(F)/(2)`
C. `(1)/(F)`
D. 4F