Read chapter 21, do you have any questions?
Compare a Proton and an Electron
You rub a plastic rod against your cat - what happens?
Newton's law of gravitation, Coulomb's law, and the intensity of a sound wave at a distance from the source have what thing in common
Why does a charged capacitor have a net charge of zero?
Why is a good conductor of electricity also a good conductor of heat?
You are in a car that has been struck by lightning. What does the electric field inside the car look like, and why?
I can rub a balloon against my hair and get a 1300-volt shock when I touch it. I can touch a car battery the wrong way and get a 12-volt shock. Why would the car battery hurt more, even though the voltage is so much lower?
Coulombs law allows you to find the force. Is the force a vector or a scalar?
How can you determine the direction of the force you find in Coulomb's law?
What does it mean to say an object is electrically polarized?
For the next section you will need the following equations
Coulomb's law. F= force,
Electric field strength equation. E = electric field strength, F = Force on the object, q=the charge of the object
Inverse square law - that something is inversely proportional to the square of the distance from the source.
Charge Q acts as a point charge to create an electric field. Its strength, measured a distance of 30 cm away, is 40 N/C. On Level - which of the three equations above would you use to calculate the Magnitude of the electrical field at any given point? Honors: What is the magnitude of the electric field strength that you would expect to be measured at a distance of 60 cm away?
A charge of
A physicist is measuring the electric field strength created by the presence of one highly charged particle. Is the field equally strong everywhere in the field? how do you know?
A positive charge q exerts a force of magnitude (- 0.20 N) on another particle with charge (- 2q). Find the magnitude of charge q if the distance separating them is equal to 50 cm.
On level - what are my givens, what is my unknown, and what equation should I use?
Honors, all of the above and find the unknown.
what direction is the force in the last problem?
Practice your Si unit prefixes
| Draggable item | arrow_right_alt | Corresponding Item |
|---|---|---|
| arrow_right_alt | |
n - nano | arrow_right_alt | |
p - pico | arrow_right_alt | |
k - kilo | arrow_right_alt | |
c - centi | arrow_right_alt |
Which is stronger
Remember the question from the heat chapter of "which had more heat, the iceberg or the cup of coffee" and while the coffee had the higher average heat, the iceberg was that much bigger therefore had more heat. Consider the above "which one is stronger question". rubbing the balloon on his head was enough for the balloon to stick to his hair, and not fall towards the earth. Let's say he is holding his hair out, so that all the electrostatic force is up, and we only rubbed it enough for the force up to be equal and opposite to gravity. Consider that the force pulling down the balloon is the gravity force stemming from the mass of the entire planet, whereas the force keeping it up is the electrostatic force from ... what?