Chapter 12: Electrostatics

This is a twelve chapter of the book Physics 12 published by Punjab Curriculum and Textbook Board, Lahore, Pakistan.

After studying this chapter, the students will be able to:

• Understand and describe Coulomb's law.
• Describe that a charge has a field of force around it.
• Understand fields of like and unlike charges.
• Appreciate the principle of inkjet printers and photostat copier as an application of electrostatic phenomena.
• Explain the electric intensity in a free and in other media.
• State and prove Gauss's law.
• Appreciate the applications of Gauss's law.
• Explain electric potential at a point in terms of work done in bringing a unit positive charge from infinity to that point.
• Relate electric field strength and potential gradient.
• Find expression for potential at a point due to a point charge.
• Describe and derive the value of electric charge by Millikan's method.
• Calculate the capacitance of parallel plate
• Recognize the effect of dielectric on the capacitance of parallel plate capacitor.
• Understand and describe electric polarization of dielectric.
• Know the process of charging and discharging of a capacitor through a resistance and calculate the time constant.
• Find energy expression of a charged capacitor.