The Electroscope
Detecting electric charge and observing electron movement
|
Electroscope
showmethephysics.com
Show Me The Physics Be Sure to Subscribe
B. Detecting Electric Charges.
1. Electroscope - used to detect presence of a charged object.
a) If no charge is present, leaves point straight down.
b) leaves separate in presence of charge.
c) Transfer of charge
1. Charge can be transferred between neutral objects by friction.
Ex) hard rubber rod rubbed with fur or wool causes electrons to be transferred to rod.
Rubber Rod - gains electrons
Becomes Negative
wool or fur
Becomes Positive
|
||||||||||
Check Your Understanding
5 quick questions — pick an answer to see if you’re right.
1. What is an electroscope used for?
2. The leaves of a charged electroscope spread apart. Why?
3. A hard rubber rod is rubbed with fur. What charge does the rod get?
4. After rubbing a rubber rod with fur, what is the charge of the fur?
5. When a hard rubber rod is rubbed with wool, where does the rod's charge come from?