Two long, straight, parallel wires of length 3.6 m carry parallel currents of 3.

Question

Two long, straight, parallel wires of length 3.6 m carry parallel currents of 3.6 A and 0.9 A.

(a) If the wires are separated by a distance of 3.2 cm, what is the magnitude of the force between the two wires?
? N

(b) Is this force attractive or repulsive? (choose one)

attractive

or

repulsive     

(c) If the currents are in opposite directions (antiparallel), how do the answers to parts (a) and (b) change? What is the magnitude of the force between the two wires?
? N

Is this force attractive or repulsive? (choose one)

attractive

or

repulsive   

Explanation / Answer

If they are in same direction,it is attractive &

F = munot*I1*I2L/2pid = 2*10-7*3.6*0.9*3.6*100/3.2 = 7.29*10-5 N (ans)

When they are opposite

Magnitude = F = 7.29*10-5 N (ans)

And it will be repulsive (ans)

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