A) Find the magnitude of the net magnetic field these wires produce at point P i

Question

A) Find the magnitude of the net magnetic field these wires produce at point P if the 10 A current is to the right (Current (a) in the figure).

B) Find the magnitude of the net magnetic field these wires produce at point Q if the 10 A current is to the right (Current (a) in the figure).

C) Find the magnitude of the net magnetic field these wires produce at point P if the 10 A current is to the left (Current (b) in the figure).

D) Find the magnitude of the net magnetic field these wires produce at point Q if the 10 A current is to the left (Current (b) in the figure).

Explanation / Answer

vertical wire: B at Q: 0*I/(2pir) = 4pi*10^-7 Tm/A*10 A/(2pi*0.15 m) = 1.6*10^-5 T out of the paper
B at P: 1.6*10^-5 T into the paper

horizontal wire:
a) B at Q : 2*10^-7*10/0.08 T = 2.5*10^-5 T out of paper
B at P: 2.5*10^-5 T into paper
b) B at Q: 2.5*10^-5 T into paper
B at P: 2.5*10^-5 T out of paper

net B:
a) Bnet at P: 1.6*10^-5 into + 2.5*10^-5 in = 3.6*10^-5 T into the paper

b) Bnet at Q: 1.6*10^-5 out + 2.5*10^-5 out = 3.6*10^-5 T out of the paper

c) Bnet at P = 1.6*10^-5 into + 2.5*10^-5 out = 0.9*10^-5 T out of the paper

d) B net at Q = 1.6*10^-5 out + 2.5*10^-5 into = 0.9*10^-5 T into the paper

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