We often experience the power of nature. One of the most fearsome natural phenomena is lightning. Some people might be curious why and how it occurs. Today, we know that lightning is a flow of electricity. In this chapter we are going to study about characteristics of electricity.
Net Electrical Charge Conductors and Insulators Charged Objects Method of Charging Unit of Charge: The Coulomb Coulomb's Law Chapter Quiz
When atoms gain or lose electrons, they are called "ions."
Insulators are materials which allow very little electrical charges and heat energy to flow. Plastics, glass, dry air and wood are examples of insulators.
Conductors are materials which electrical charges and heat energy can be transmitted very easily. Almost all metals such as gold, silver, copper, iron, and lead are good conductors.
Semiconductors are materials which allow the electrical charges to flow better than insulators, but less than conductors. Examples are silicon and germanium.
Which one of these is a conductor? (a) dry air (b) lead (c) silicon (d) glass
(e.g. "a" )
How many electrons are there in 1 C of charge? (e.g. "1.00*10^10")
where:
F is the force between the two particles, q1 is the net charge on particle A, q2 is the net charge on particle B, d is the distance between the particles, k is a proportionality constant which is 9.0 * 109 Nm2/C2.
The direction of the force is on the line from one particle to the other.
Object X has a positive charge of 5.0 * 10-6 C. Object Y, carrying a positive charge of 2.5 * 10-6 C, is 0.03 m away.
A. Calculate the force on X. (e.g. "+1.55*10^10 N", or "-1.55*10^10 N")
B. What would the force be if the charge on Y were negative.
Solution
An object, A, with +8.25 * 10-6 C charge, has two other charges nearby. Object B, -3.5 * 10-6 C, is 0.030 m to the right. Object C, +2.50 * 10-6 C, is 0.050 m below. What is the net force and the angle on A? (e.g. "1.0*10^10 N, 10 deg.")
The electric force is vector quantity. Try to solve the problem graphically.
Try Chapter 11 Quiz and see how much you learned.
[Previous Lesson] - [Ch 11] - [Ch 12] - [Ch 13] - [Ch 14] - [Ch 15]