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Question:

A negative test charge is moving near a long straight wire carrying a current. The force acting on the test charge is parallel to the direction of the current. The motion of the charge is: Towards the wire, Away from the wire, Parallel to the wire along the current, Parallel to the wire opposite to the current

Parallel to the wire opposite to the current

Towards the wire

Away from the wire

Parallel to the wire along the current

Solution:

Magnetic field at A → out of the plane of the paper B=B0^k ⇒ force on charged particle: ⇒ F = −q v → × B → ⇒ F = +qvB0^j Therefore, the particle moves towards the wire.