Two long parallel wires 0.5m apart carry 50A and 100A currents in opposite direc

Question

Two long parallel wires 0.5m apart carry 50A and 100A currents in opposite directions. a) Calculate the force (force is a vector, so you need magnitude and direction) exerted on a 1.5m length of each wire. b) Each current is doubled. Repeat part a). Two long parallel wires 0.5m apart carry 50A and 100A currents in opposite directions. a) Calculate the force (force is a vector, so you need magnitude and direction) exerted on a 1.5m length of each wire. b) Each current is doubled. Repeat part a). Two long parallel wires 0.5m apart carry 50A and 100A currents in opposite directions. a) Calculate the force (force is a vector, so you need magnitude and direction) exerted on a 1.5m length of each wire. b) Each current is doubled. Repeat part a).

Explanation / Answer

a) F = uo*I1*I2*L/(2pi*R) = (2*10^-7*50*100*1.5)/(0.5) = 3.0 mN

b) F = uo*I1*I2*L/(2pi*R) = (2*10^-7*100*200*1.5)/(0.5) = 12.0 mN

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