Wire 1 has a large current i flowing out of the page (), as shown in the diagram

Question

Wire 1 has a large current i flowing out of the page (), as shown in the diagram. Wire 2 has a large current i flowing into the page (). In what direction does the magnetic field point at position P? Two parallel wires I and II that are near each other carry current i and 3i both in the same direction. Compare the forces that the two wires exert on each other. (a) Wire I exerts a stronger force on wire II and II exerts on I. (b) Wire II exerts a stringer force on wire I than I exerts on II. (c) The wires exert equal magnitude attractive forces on each other. (d) The wire exert equal magnitude repulsive forces on each other. (e) The wires exert no forces on each other.

Explanation / Answer

23. The answer is a. This is obtained by using the right-hand rule. According to it, the current coming out of the paper creates a magnetic field in the upward direction. Similarly, the other current creates a field in the upward direction too. As both are directed along the same direction. They end up pointing up.

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