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Electrostatics questions

Electrostatics questions | form five Physics

Find Electrostatics examination questions, form five Physics in acaproso.com

# Question
1

Give the meaning of the terms capacitance and relative permittivity.


Short answers
2

Calculate the capacitance of a pair of parallel plates 0.1 m by 0.1 m with an air gap of 5mm.


Mathematical Calculation
3

What is a Van de Graaff generator?


Short answers
4

In a Van de Graaff generator, the shell electrode is at 25x10​V. If the dielectric strength
of the gas surrounding the electrode is 5x107 V/m, calculate the minimum radius of the
spherical shell.


Mathematical Calculation
5

State Coulomb’s law of forces.


Short answers
6

An electron is situated in a uniform electric field of field strength of 1.2×10​Vm-1​ . Find
the force acting on it and its acceleration if it has travelled 20mm from rest.


Mathematical Calculation
7

Define the terms electric potential and electric potential and electric field-strength E at a point in hte electrostatic field.


Short answers
8

How electric potential and electric field-strength E are related?.


Short answers
9

Outside the sphere, a charged sphere behaves like its charges were concentrated at the centre. If the electric field strength inside the sphere is zero and one sphere of radius 5.0cm carries a positive charge of 6.7nC, calculate;

  1. The potential at the surface of the sphere.
  2. The capacitance of the sphere.

Mathematical Calculation
10

Figure 1 shows two horizontal parallel conducting plates in a vacuum.

Parallel conducting plates in a vacuum.

If a small particle of mass 4x10-12Kg carries a positive charge of 3.0x10-14 C is released at point A close to the upper plate.

  1. What is the total force on this particle?
  2. Calculate the kinetic energy of the particle when it reaches the lower plate.

Mathematical Calculation