Two identical magnetic poles each of strength 'm' are placed at the vertices of an equilateral triangle of side 'd' then resultant magnetic induction at the third vertex is

Options

A. `(mu_0 )/(4 pi ) (m )/(d^2)`
B. ` sqrt(2) ( mu_0) /( 4 pi ) (m) /( d^2)`
C. `sqrt(3) (mu_0 )/(4 pi ) (m)/( d^2)`
D. Zero