The grid in the cathode ray oscilloscope _.
Correct answer: B. Controls the brightness of the spot formed
- 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
Explanation
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.
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An electric field is the force experienced per unit positive test charge, with the field of a point charge given by E = kQ/r² and directed away from positive charges or toward negative charges. Questions involve field lines, superposition and force on a charge, while electric field must be distinguished from electric potential.
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