2 parallel wires are oriented such that one wire isimmediately above the other a

Question

2 parallel wires are oriented such that one wire isimmediately above the other as shown below. The current inthe lower wire is I 2 = 38.0A to the right and thedistance between wires is d=2.20 cm. A second current flowsin upper wire so that upper wire "floats" above lower wire due tomagnetic repulsion between 2 wires. Upper wire is made ofcopper, densitry =8.90 g/cm3 and has diameter of D = 1.10 mm a. What will be direction of magnetic field at locationof upper wire as caused by lower wire b. In what direction should the current flow in theupper wire so that the force between these two wires isrepulsive?

Explanation / Answer

as there is repulsion between those two wires current in both the wires should be opposite a)direction of the magnetic field is perpendicular to the plane and is penetrating out of the plane b)direction of current is to the left mass per unit length of the wire=8.45gms 0i1i2/2d=8.45*9.8*10-3 hencei2=239.7A

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