Answer to Question 5

The force on each metre length of the wire is 2 × 10^{-7} N m^{-1} when the current is 1.0 A. Show that the statement above is true.

Formula

F = (4p × 10^{-7} H m^{-1} × 1.0 A × 1.0 A × 1.0 m) ÷ (2p × 1.0 m) = 2 × 10^{-7} N m^{-1} (QED)