Exam-style question
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Which of the following best describes a radial field pattern?.
- A.Field lines that are parallel and evenly spaced across a region
- B.Field lines that emanate from or converge to a point source
- C.Field lines that form closed loops around a current-carrying wire
- D.Field lines that are perpendicular to a uniform magnetic field
Model answer
What a good answer should say
- Field lines that emanate from or converge to a point source
Explanation
Why this works
Define both: A radial field has lines that spread out from (or come together at) a point source, giving a spherical symmetry; a uniform field has lines that are straight, parallel and evenly spaced. Identify key difference: radial fields change direction with distance from the source, whereas uniform fields maintain the same direction everywhere.
Explain when each applies: Radial fields occur around point charges or masses, while uniform fields are produced by large, evenly distributed sources such as a long straight current or a large charged plate. Conclude: The option describing lines emanating from or converging to a point source correctly identifies a radial field pattern.
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