Answer to Question 5

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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)