Answer to Question 1

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A flux density of 3.5 mT is measured 15 cm from a current carrying wire.  Calculate the current in the wire.

I = 2prB/m0

 

I = (2 p 0.15 m 3.5 10-3 T) 4 p 10-7 H m-1

 

I = 2625 A = 2600 A (2 s.f.)