physics ..PLEASE HELP ASSIGN DUE SOON :(
posted by Ann .
Three charges, q1=+45.9nC q2=+45.9nC and q3=+91.8nC are fixed at the corners of an equilateral triangle with a side length of 3.70cm. Find the magnitude of the electric force on q3.
k =9•10^9 N•m²/C²
Cosine law for forces: