A metal rod PQ (carrying current from P to Q) is placed perpendicular to the infinite long wire carrying current Io. If this arrangement lies in a horizontal plane, then the rod PQ will rotate:
Correct answer: A. Clockwise
- A. Clockwise
- B. Anticlockwise
- C. Along PQ
- D. Does not rotate
Explanation
If the given arrangement lies in a horizontal plane, then the rod PQ will rotate clockwise due to the torque. By the right-hand grip rule, the direction of the magnetic field due to current Io at point P is on the screen. The direction of current in rod PQ is given from P to Q. Hence, the force at point P is towards the top of the screen by Fleming's left-hand rule. Since the rod is pivoted, the rod rotates in a clockwise direction.
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Magnetic flux density and magnetic flux describe the strength of a magnetic field and the field passing through a surface. A charged particle moving through a magnetic field experiences a force perpendicular to its velocity and may follow circular or helical motion, depending on the angle between velocity and field.
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