Physics Question:
Which of the following statements is correct concerning electric and magnetic fields?
- A. Electric fields originate from a single charged particle, but magnetic fields cannot originate from a single charged particle. ✔️
- B. Neither electric nor magnetic fields originate from a single charged particle. ✘
- C. Electric and magnetic fields can only be generated by moving charges. ✘
- D. Electric and magnetic fields cannot originate from the same source. ✘
Correct Answer:
Option A is the correct statement.
Explanation:
– A single static charged particle (not in motion) generates an electric field around it.
– This is described by Coulomb’s Law, which states that a point charge exerts an electric field in all directions around it.
– However, a magnetic field is produced only when electric charges are in motion, such as in the case of electric currents or time-varying electric fields.
– A single static charged particle (not in motion) generates an electric field around it.
– This is described by Coulomb’s Law, which states that a point charge exerts an electric field in all directions around it.
– However, a magnetic field is produced only when electric charges are in motion, such as in the case of electric currents or time-varying electric fields.
Analysis of Each Option:
A. True – A stationary charge produces only an electric field. A magnetic field requires charge motion (current).
B. False – Electric fields absolutely do originate from stationary charges.
C. False – Only magnetic fields require motion; electric fields can exist from static charges.
D. False – Both fields can originate from the same source, such as a moving charged particle.
Conclusion:
The correct understanding is that:
Electric fields arise from any charged particle (static or moving), whereas magnetic fields require either motion of charges (like a current) or a changing electric field.