If a glass plate is inserted between the plates of a capacitor in series with a lighted bulb, the brightness of the bulb:
Correct answer: C. Brightness decreases
- A. Remains the same
- B. Brightness increases
- C. Brightness decreases
- D. No light
Explanation
When a dielectric material, like a glass plate, is introduced between the plates of a capacitor, it increases the capacitance. In a series circuit with a capacitor and a lighted bulb, higher capacitance allows more charge to be stored for the same voltage. This results in a reduced potential difference across the bulb, causing a decrease in brightness.Explanations for Wrong Choices:- (a) Remains the same: This is not correct because introducing a dielectric increases capacitance, altering the potential difference across the bulb and decreasing brightness.- (b) Brightness increases: This is not correct. Adding a dielectric increases capacitance, reducing the potential difference across the bulb and causing a decrease in brightness.- (d) No light: While inserting a dielectric decreases brightness, it does not completely eliminate the light as would occur in an open circuit.I hope this aligns with the format you specified. If you have more questions, feel free to ask.
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About Electromagnetic Waves
Electromagnetic waves consist of mutually perpendicular, oscillating electric and magnetic fields that also remain perpendicular to the direction of propagation. They travel through vacuum at the speed of light and include radio waves, microwaves, infrared, visible, ultraviolet, X-rays and gamma rays. Unlike mechanical waves, they do not require a material medium.
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