Physics · Magnetism and Electromagnetic Induction
Work through this past-paper style MCQ, then read the full explanation. Practice more physics questions on mMCQ with adaptive practice and topic analytics.
The grid in the cathode ray oscilloscope _____________.
- A
Controls the number of waves
- B
Controls the brightness of the spot formed
- C
Accelerates electrons
- D
Has positive potential with respect to the cathode
The correct answer is B: The grid in a cathode ray oscilloscope controls the brightness of the spot formed on the screen. This is because the grid modulates the intensity of the electron beam, thereby affecting the brightness. Option A is incorrect because the grid does not control the number of waves. Option C is incorrect because electron acceleration is the role of the anodes. Option D is incorrect because the grid is at a negative potential compared to the cathode, which helps in controlling the flow of electrons.
The grid does not control the number of waves; it is responsible for manipulating the electron beam.
Correct! The grid in a cathode ray oscilloscope controls the intensity of the electron beam, thus adjusting the brightness of the spot on the screen.
Electrons are accelerated by the anodes, not the grid.
The grid is typically at a negative potential relative to the cathode to control the electron flow.
Tagged under Physics · Magnetism and Electromagnetic Induction · 2010