Moderate

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.

Last updated

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.

Practise Alternating Current

592 free Alternating Current MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.

Exams that ask Physics questions like this

Physics is on 13 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.

Related questions