Electrostatics Quiz: Observation & Charges

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5 Questions

Which force is greater between the two masses in the given scenario?

Electric force

What is the approximate value of the gravitational force between the two masses?

4.27 × 10^-13 N

In Example 6, what is the charge of the object experiencing a net force of 3.31 N at 29 degrees?


What is the direction of the net force on the object with a charge of -4μC in Example 6?

-29 degrees

How should F1 and F2 be added together as vectors in Example 6?


Study Notes

Course Overview

  • The course is graded based on 40% Midterm Exam and Assignments, 20% Practical Exam and Assignments, and 40% Final Paper Exam.
  • The course covers topics including Electricity, Magnetism, and Electric Circuits.


  • Electric charge and substances, Electric Force, Column`s Law, Current (AC and DC), Electric Flux, Gauss Law, Electric Volt, Capacitance, and dielectrics.
  • Properties of electric charges:
  • Electric forces and charges can be demonstrated through simple experiments.
  • There are two kinds of electric charges: positive and negative.
  • Like charges repel each other, and unlike charges attract each other.
  • Coulomb's Law:
  • The electric force between two stationary charged particles is inversely proportional to the square of the separation between the particles.
  • The electric force is proportional to the product of the charges on the two particles.
  • The electric force is attractive if the charges are of opposite sign and repulsive if the charges have the same sign.
  • Electric force equation: F = (Ke * q1 * q2) / r^2, where F is the force, Ke is the Coulomb's constant, q1 and q2 are the charges, and r is the distance between the charges.
  • Permittivity constant of free space: εo = 8.85 x 10^-12 C^2/N.m^2

Charge and Matter

  • Particle symbol:
  • Proton (P): positive charge
  • Neutron (N): neutral
  • Electron (E): negative charge
  • Charge and mass of particles:
  • Proton: 1.6 x 10^-19 C, 1.67 x 10^-27 Kg
  • Neutron: 0, 1.67 x 10^-27 Kg
  • Electron: -1.6 x 10^-19 C, 9.1 x 10^-31 Kg

Examples and Applications

  • Example 1: The attractive force between a comb and bits of paper demonstrates the existence of electric forces and charges.
  • Example 2: The magnitudes of the electric force and the gravitational force between the electron and proton in a hydrogen atom can be calculated using Coulomb's law.
  • Example 3: The electric force between two objects with charges of 2 μC and 6 μC can be calculated using Coulomb's law.
  • Example 4: The value of two equal charges that repel each other with a force of 0.1 N when situated 50 cm apart in a vacuum can be calculated using Coulomb's law.
  • Example 5: The electric force and gravitational force between two 40-gram masses each with a charge of 3 μC placed 50 cm apart can be compared.
  • Example 6: The net force on an object with a charge of -4 μC can be calculated using Coulomb's law and vector addition.

Test your knowledge on electrostatics with this quiz based on an observation of attraction between a rubbed glass rod and a rubber rod, indicating different states of electrification. Learn about the principles that like charges repel and unlike charges attract.

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