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The reflecting mirror mounted on the moving coil of a vibration galvanometer is replaced by a bigger size mirror. This will result in
- a)lower frequency of resonance & lower amplitude of vibration
- b)lower frequency of resonance but the amplitude of vibration is unchanged
- c)higher frequency of resonance & lower amplitude of vibration
- d)higher frequency of resonance but the amplitude of vibration is unchanged
Correct answer is option 'A'. Can you explain this answer?
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The reflecting mirror mounted on the moving coil of a vibration galvan...
(a)
Bigger size mirror results in increased inertia constant J.
Bigger size mirror results in increased inertia constant J.
as J increases both fn & A decrease.
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The reflecting mirror mounted on the moving coil of a vibration galvan...
The Effect of Replacing the Reflecting Mirror on a Vibration Galvanometer
When the reflecting mirror on a moving coil of a vibration galvanometer is replaced by a bigger size mirror, it will result in a lower frequency of resonance and a lower amplitude of vibration. This can be explained by the following factors:
1. Mass of the Mirror:
- When a bigger size mirror is used, it generally has more mass compared to a smaller mirror.
- The mass of the mirror is directly proportional to the inertia of the moving coil system.
- A higher mass will increase the inertia of the system, making it more difficult to set the coil into motion.
- As a result, the natural frequency of resonance of the system decreases.
2. Stiffness of the Spring:
- The vibration galvanometer uses a spring to provide the restoring force for the coil's motion.
- The spring constant represents the stiffness of the spring.
- When a bigger mirror is used, the coil experiences a stronger force due to its increased mass.
- To achieve resonance, the spring needs to provide a force that matches the force exerted by the coil.
- With a bigger mass, the spring has to work harder to provide the required force, resulting in a lower natural frequency of resonance.
3. Damping:
- Damping in a vibration galvanometer is responsible for reducing the amplitude of vibration over time.
- With a bigger mirror, there is a greater air resistance and energy dissipation during each vibration cycle.
- This increased damping effect leads to a decrease in the amplitude of vibration.
Conclusion:
When the reflecting mirror on a moving coil of a vibration galvanometer is replaced by a bigger size mirror, it affects the system's mass, spring stiffness, and damping. The increased mass and corresponding change in spring force result in a lower natural frequency of resonance. Additionally, the increased air resistance and energy dissipation lead to a lower amplitude of vibration. Thus, the correct answer is option 'A': lower frequency of resonance and lower amplitude of vibration.
When the reflecting mirror on a moving coil of a vibration galvanometer is replaced by a bigger size mirror, it will result in a lower frequency of resonance and a lower amplitude of vibration. This can be explained by the following factors:
1. Mass of the Mirror:
- When a bigger size mirror is used, it generally has more mass compared to a smaller mirror.
- The mass of the mirror is directly proportional to the inertia of the moving coil system.
- A higher mass will increase the inertia of the system, making it more difficult to set the coil into motion.
- As a result, the natural frequency of resonance of the system decreases.
2. Stiffness of the Spring:
- The vibration galvanometer uses a spring to provide the restoring force for the coil's motion.
- The spring constant represents the stiffness of the spring.
- When a bigger mirror is used, the coil experiences a stronger force due to its increased mass.
- To achieve resonance, the spring needs to provide a force that matches the force exerted by the coil.
- With a bigger mass, the spring has to work harder to provide the required force, resulting in a lower natural frequency of resonance.
3. Damping:
- Damping in a vibration galvanometer is responsible for reducing the amplitude of vibration over time.
- With a bigger mirror, there is a greater air resistance and energy dissipation during each vibration cycle.
- This increased damping effect leads to a decrease in the amplitude of vibration.
Conclusion:
When the reflecting mirror on a moving coil of a vibration galvanometer is replaced by a bigger size mirror, it affects the system's mass, spring stiffness, and damping. The increased mass and corresponding change in spring force result in a lower natural frequency of resonance. Additionally, the increased air resistance and energy dissipation lead to a lower amplitude of vibration. Thus, the correct answer is option 'A': lower frequency of resonance and lower amplitude of vibration.
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The reflecting mirror mounted on the moving coil of a vibration galvanometer is replaced by a bigger size mirror. This will result ina)lower frequency of resonance & lower amplitude of vibrationb)lower frequency of resonance but the amplitude of vibration is unchangedc)higher frequency of resonance & lower amplitude of vibrationd)higher frequency of resonance but the amplitude of vibration is unchangedCorrect answer is option 'A'. Can you explain this answer?
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The reflecting mirror mounted on the moving coil of a vibration galvanometer is replaced by a bigger size mirror. This will result ina)lower frequency of resonance & lower amplitude of vibrationb)lower frequency of resonance but the amplitude of vibration is unchangedc)higher frequency of resonance & lower amplitude of vibrationd)higher frequency of resonance but the amplitude of vibration is unchangedCorrect answer is option 'A'. Can you explain this answer? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about The reflecting mirror mounted on the moving coil of a vibration galvanometer is replaced by a bigger size mirror. This will result ina)lower frequency of resonance & lower amplitude of vibrationb)lower frequency of resonance but the amplitude of vibration is unchangedc)higher frequency of resonance & lower amplitude of vibrationd)higher frequency of resonance but the amplitude of vibration is unchangedCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The reflecting mirror mounted on the moving coil of a vibration galvanometer is replaced by a bigger size mirror. This will result ina)lower frequency of resonance & lower amplitude of vibrationb)lower frequency of resonance but the amplitude of vibration is unchangedc)higher frequency of resonance & lower amplitude of vibrationd)higher frequency of resonance but the amplitude of vibration is unchangedCorrect answer is option 'A'. Can you explain this answer?.
The reflecting mirror mounted on the moving coil of a vibration galvanometer is replaced by a bigger size mirror. This will result ina)lower frequency of resonance & lower amplitude of vibrationb)lower frequency of resonance but the amplitude of vibration is unchangedc)higher frequency of resonance & lower amplitude of vibrationd)higher frequency of resonance but the amplitude of vibration is unchangedCorrect answer is option 'A'. Can you explain this answer? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about The reflecting mirror mounted on the moving coil of a vibration galvanometer is replaced by a bigger size mirror. This will result ina)lower frequency of resonance & lower amplitude of vibrationb)lower frequency of resonance but the amplitude of vibration is unchangedc)higher frequency of resonance & lower amplitude of vibrationd)higher frequency of resonance but the amplitude of vibration is unchangedCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The reflecting mirror mounted on the moving coil of a vibration galvanometer is replaced by a bigger size mirror. This will result ina)lower frequency of resonance & lower amplitude of vibrationb)lower frequency of resonance but the amplitude of vibration is unchangedc)higher frequency of resonance & lower amplitude of vibrationd)higher frequency of resonance but the amplitude of vibration is unchangedCorrect answer is option 'A'. Can you explain this answer?.
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