Solution to 1986 Problem 29

The magnetic field about the wire will be azimuthal and its orientation will be determined by the right-hand rule. The force on the negative test particle will also be determined by calculating q \mathbf{v} \times \mathbf{B} using the other right-hand rule. The result is that the particle will feel a force in the direction parallel to the current if it is moving towards the wire. Therefore, answer (A) is correct.

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