Question

the figure below shows the cross - section of three long, straight wires carrying the same current. the distance between adjacent wires is d. in what direction does the magnetic field point at a location a distance d above wire b? down up up and to the left up and to the right save for later submit answer 29.1 magnetic field due to a current

Explanation:

Step1: Apply right - hand rule

Curl the fingers of your right - hand. When the thumb points in the direction of the current (out of the page for a and b, into the page for c), the fingers point in the direction of the magnetic field around the wire.

Step2: Analyze the contribution of each wire

Wire a and b have current out of the page. The magnetic field due to wire a at the point above wire b will have a component to the left and a component up. The magnetic field due to wire b at that point will have a zero horizontal component (symmetric about the wire) and an upward component. The magnetic field due to wire c (current into the page) will have a component to the right and a component up. The horizontal components from a and c will cancel out (due to symmetry and equal currents), and the net magnetic field will be upward.

Answer:

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