In a certain region, a magnetic field is directed vertically downward. If a plane flies due South, which part of the plane will be negatively charged?
Correct answer: D. Right wingtip
- A. Front part
- B. Back part
- C. Left wingtip
- D. Right wingtip
Explanation
Let +x = East, +y = North, +z = Up. Plane velocity v = South = −y. B = Down = −z.v × B = (−y) × (−z) = +x (East). That pushes positive charges to the east wing. Electrons (negative) are pushed opposite→ west. Facing south, the right wing corresponds to west, so right wingtip becomes negatively charged.So the final answer D (right wingtip negative) is correct.
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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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