# Answer to Question #1758 in Electromagnetism for aa

Question #1758

Two wires of same length are placed parallel to each other at a distance of 0.65 metres from each other.<br>Calculate the ratio of the force they exert on each other assuming 10 amperes current in the first wire and 5 amperes in the second wire

Expert's answer

Denote the current in the first wire as I

The force that act at the unit length is

_{1}(10 amperes) and the current in the second wire as I_{2}(5 amperes).The force that act at the unit length is

**F**

_{u}=μ_{0}/4π (2I_{1}I_{2})/r=10^{-7}*2*10*5 / 0.65=153.84*10^{-7}N.
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