Physics - Electrostatics Question with Solution | TestHub
Two large oppositely charged insulated plates have a uniform electric field between them as shown. The distance between the plates is increased by a small amount. Which of the following statements is/are correct.
Statement I: The electric field strength decreases.
Statement II: The electrostatic force of attraction between the plates increases.
Statement III: The potential difference between the plates increases
Options:
Answer:
Solution:
Since charge and charge density on plate remains constant, the electric field between the plates does not change due to the increase in separation of plates. Now charge on one plate and electric field in its surroundings does not change, therefore the magnitude of the electrostatic force on that plate remains constant. Only the electrostatic potential difference between the plates increases as a result of increase in their separation.
The charge remains constant. If the distance is increased, the capacitance will decrease (C ∝ A/d) and since Q = CV, the potential difference must increase by the same factor that the distance increases.
