Short Answer
3 × 10⁸ m/s is the best answer.
Electromagnetism questions become manageable once you separate source, field, potential, current, and force. Most wrong answers mix those layers together or ignore direction.
c = 299,792,458 m/s ≈ 3 × 10⁸ m/s — the defined speed of light in vacuum.
Why This Answer Is Correct
This is a Easy-level question in Electromagnetism. The prompt is really testing whether you can connect the concept to its defining physical relationship instead of picking a nearby-but-wrong term.
Keep charge, field, potential, and current distinct. That single habit fixes a large fraction of electromagnetism errors.
Choices At A Glance
- A. 3 × 10⁶ m/s
- B. 3 × 10⁸ m/s
- C. 3 × 10¹⁰ m/s
- D. 3 × 10⁴ m/s
When similar options appear on an exam, eliminate the ones that break the core law, use the wrong units, or confuse a definition with a consequence.
Topic Snapshot
Topic: Electromagnetism
Difficulty: Easy
Best next move: Re-state the governing law in your own words, then solve one more example from the same topic before moving on.