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Direction of Electric and Magnetic Fields in Various Scenarios

This text explores the direction of electric and magnetic fields in different situations, such as a spinning bar magnet, falling particles, rotating loops, and moving charged particles. Discover the correct direction of the fields at specific points.

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Direction of Electric and Magnetic Fields in Various Scenarios

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  1. A bar magnet is spinning clockwise as viewed from a position south of the magnet, about a horizontal, north-south axis that is perpendicular to, and passes through the center of, the bar magnet. What is the direction of the electric field, if any, directly above the magnet at an instant when the magnet is vertical with its north end up? a) Northward e) Upward b) Southward f) Downward c) Eastward g) There is no electric field. d) Westward h) None of the above.

  2. A tiny lead pellet having a negative charge is falling toward the ground. In the rest frame of the ground, at a point due north of the pellet at the same elevation as the pellet, what is the direction of the magnetic field, if any, due to the falling particle? a) Northward e) Upward b) Southward f) Downward c) Eastward g) There is no magnetic field. d) Westward h) None of the above.

  3. A horizontal loop carries a current that is clockwise as viewed from above, but, the loop is rotating counterclockwise as viewed from above. What is the direction of the electric field, if any, due to the rotating loop at a point at the same elevation as, and due north of, the loop? a) Northward e) Upward b) Southward f) Downward c) Eastward g) There is no electric field. d) Westward h) None of the above.

  4. A positively charged particle is moving northward, directly toward point P. In the reference frame in which point P is at rest, what is the direction of the magnetic field, if any, at point P? a) Northward e) Upward b) Southward f) Downward c) Eastward g) There is no magnetic field. d) Westward h) None of the above.

  5. In your reference frame, a downward-directed magnetic field vector is moving eastward at the speed of light. In your reference frame, what is the direction of the corresponding electric field, if any? a) Northward e) Upward b) Southward f) Downward c) Eastward g) There is no electric field. d) Westward h) None of the above.

  6. In your reference frame, a northward-directed electric field vector is moving downward. In your reference frame, what is the direction of the corresponding magnetic field, if any? a) Northward e) Upward b) Southward f) Downward c) Eastward g) There is no magnetic field. d) Westward h) None of the above.

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