Question

A 155 cm person is looking up at three power wires running east to west between two pillars. The distance between the ground and the power wires is 20ft. The person is directly under the middle wire. The distance between the three wires is 84 cm. The current of the south wire is moving west with a value of 16 A. The current of the middle wire is moving west with a value of 10 A. The current of the north wire is moving east with a value of 19 A.

What is the net magnetic force per unit length on the center wire and direction of its deflection?

Answer 1

North Iz = 19A I 27 10A West 846mm East I, = 16A south tone on middle wire by Soush wire X, (per wont length) +12= t. I, I where I = 16A, I = 10A, 8=84cm=0.84 m. शा Mo = 41610-) In the question it not clear the distance between adfascent cites (8). It is only said that, distance between 3 wires. is 84cm. I think it may be 8=84cm]. Fiz = 4TX10 - 7 x 16 x 10 = 3.8095410 N/m. 21 x 0-84 middle wire by north wire Force on F32 = M. Iz Iz – 411X102x10x19 - = 4.524x10 N/m २४ 25 x 0.84 If cussents are in same direction, force between cires will be attractive and if consents are it opposite direction, fore will be repulsive. Thore fose, I attracts Ig and Iz repels I Net done on middle wire = Fat F32=3.8095410 4 4.524500-5 F = 8.3335x105 N/m. As Fir and Fe are towards south, resultant done, I will be towards south.