6. Two long parallel straight wires carry equal currents in opposite directions.

Question

6. Two long parallel straight wires carry equal currents in opposite directions. At a point exactly midway between the wires, the direction of the Magnetic Field they produce is: a) zero b) non-zero and along a line connecting the wires c) non-zero and parallel to the wires to the plane of the two wires d) non-zero and perpendicular e) none of the above A magnetic field exerts a force on a charged particle: a) always b) never c) if the charged particle is moving across the magnetic field lines d if the charged particle is moving along the magnetic field lines e) if the charged particle is moving

Explanation / Answer

The midpoint between the two wires is at equal distance from two wires. So the magnetic field is equal in magnitude and perpendicular to the plane of wires.

ans: (d)

The magnetic field exerts force on the charged particle when it is moving.

ans: (e)

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