The magnitude of the magnetic field produced by a long straight wire is proporti

Question

The magnitude of the magnetic field produced by a long straight wire is proportional to the current passing through the wire and inversely proportional to the distance from the wire. Consider the five pairs of long parallel wires shown below. The arrows indicate the direction of the current in each wire, with small arrows representing a current of 2 A and large arrows representing a current of 7 A. For each pair, determine in which one of the following regions the net magnetic field is zero someplace:     A) on the left of both wires     B) between the two wires     C) on the right of both wires     D) none of the above (i.e. nowhere) Do not consider distances very far from the wires since in this case the magnetic field always goes to zero.

The magnitude of the magnetic field produced by a long straight wire is proportional to the current passing through the wire and inversely proportional to the distance from the wire. Consider the five pairs of long parallel wires shown below. The arrows indicate the direction of the current in each wire, with small arrows representing a current of 2 A and large arrows representing a current of 7 A. For each pair, determine in which one of the following regions the net magnetic field is zero someplace: on the left of both wires B) between the two wires C) on the right of both wires D) none of the above (i.e. nowhere) Do not consider distances very far from the wires since in this case the magnetic field always goes to zero. (A) Left (B) Between (C) Right (D) Nowhere

Explanation / Answer

From the Ampere’s right hand rule, hold a current carrying wire in your right hand as the stretched thumb showing direction of current flow, then the curl of the fingers around the wire shows the direction of magnetic field.

For figure (A), option (D) is correct.

For figure (B), option (A) is correct.

For figure (C), option (B) is correct.

For figure (D), option (B) is correct.

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