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The electromagnetic radiations are caused by [1999]
- a)a stationary charge
- b)uniformly moving charges
- c)accelerated charges
- d)all of above
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
The electromagnetic radiations are caused by [1999]a)a stationary ch...
A stationary charge produces electric field only; an uniformly moving charge produces localised electromagnetic field; an accelerated charge produces electromagnetic radiations.
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The electromagnetic radiations are caused by [1999]a)a stationary ch...
Causes of Electromagnetic Radiations
The correct answer to the question is option 'C' - accelerated charges. Let's break down why this is the case:
Accelerated Charges
- When charges are accelerated, they emit electromagnetic radiation. This is because accelerating charges create changing electric and magnetic fields.
- According to Maxwell's equations, changing electric fields induce magnetic fields, and changing magnetic fields induce electric fields. This continuous cycle results in the generation of electromagnetic waves.
- Therefore, any time charges are accelerated, such as in an antenna transmitting radio waves or in an electron moving in a circuit, electromagnetic radiation is produced.
Stationary Charges and Uniformly Moving Charges
- Stationary charges do not produce electromagnetic radiation because there is no acceleration involved. In this case, the electric and magnetic fields remain constant.
- Similarly, uniformly moving charges also do not emit electromagnetic radiation because their velocity is constant, and there is no acceleration to create changing fields.
Conclusion
- In summary, electromagnetic radiations are caused by accelerated charges due to the changing electric and magnetic fields they create. This fundamental principle is essential in understanding the generation and propagation of electromagnetic waves in various applications.
The correct answer to the question is option 'C' - accelerated charges. Let's break down why this is the case:
Accelerated Charges
- When charges are accelerated, they emit electromagnetic radiation. This is because accelerating charges create changing electric and magnetic fields.
- According to Maxwell's equations, changing electric fields induce magnetic fields, and changing magnetic fields induce electric fields. This continuous cycle results in the generation of electromagnetic waves.
- Therefore, any time charges are accelerated, such as in an antenna transmitting radio waves or in an electron moving in a circuit, electromagnetic radiation is produced.
Stationary Charges and Uniformly Moving Charges
- Stationary charges do not produce electromagnetic radiation because there is no acceleration involved. In this case, the electric and magnetic fields remain constant.
- Similarly, uniformly moving charges also do not emit electromagnetic radiation because their velocity is constant, and there is no acceleration to create changing fields.
Conclusion
- In summary, electromagnetic radiations are caused by accelerated charges due to the changing electric and magnetic fields they create. This fundamental principle is essential in understanding the generation and propagation of electromagnetic waves in various applications.
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