General Electrostatics
Induction & Conduction
Testing the charge
Electric Fields
Potential Difference
100
Do like charges attract or repel?
repel
100
When induction occurs does the charge of the inducted item become the same as the charged item or the opposite of the charged item?
opposite
100
If I test the charge of an object with the same charge as the electroscope then__________.
The leaves separate more
100
Lines drawn to represent an electric field extend __________ a positive charge and __________ a negative charge.
away from, toward
100
What is the unit for potential difference?
Volts
200
What are the two ways I can make the leaves on an electroscope stay separated?
Electrostatic Conduction and Electrostatic induction
200
How does induction occur?
Induction occurs when a charged object is put near an electroscope then the electroscope is grounded. This makes the electroscope the opposite charge of the charged item.
200
By looking at a negative electroscope how would the leaves move to indicate the charged item is negative?
The leaves repel away from each other.
200
On the board draw the electrical field lines that would be between 2 positive particles.
See powerpoint
200
Moving 2.5 × 10–6 coulombs of charge from point A to point B in an electric field requires 6.3 × 10–4 joules of work. The potential difference between points A and B is approximately__________.
252 V
300
Draw an electroscope when a negatively charged rod is near a neutral electroscope? Make sure to indicate the charge of the metal knob and the leaves.
See powepoint
300
If I use conduction to charge an electroscope by using a positively glass rod what charge does the electroscope now have?
positive
300
Describe how the protons move in a positively charged electroscope when a negative rod is near the knob of the electroscope.
Protons do not move so they stay where they are in the rod.
300
A force of 40 N acts on a charge of .25 C in a region of space. The electric field at the point of the charge is______.
160 N/C
300
If 120 J of work are performed to move one electron from a positive plate to a negative plate, what potential difference exists between the plates?
7.5 x 10^20V
400
How does the distribution of charges change in a neutral electroscope change when a positively charged rod is brought near the electroscope?
As the positively charged rod approaches the electroscope the electrons are attracted to the rod so they move toward the knob of the electroscope. So the top of the electroscope is negative and the bottom of the electroscope is positive.
400
Explain how the electrons travel in an electroscope when it is charged by conduction when using a negatively charged rubber rod.
The electrons at first are repeeled by the rubber rod before it touches the electroscope, so the electrons move to the leaves. Then when the rubber rod touches the electroscope the electrons from the rod transfer into the knob of the electroscope.
400
Describe how the electrons move in a positively charged electroscope when a negative rod is near the knob of the electroscope.
The electrons are repelled by the rod so they move into the leaves causing the leaves to come together.
400
A positive object is in an electric field of 50 N/C that exerts a force of 2.0 × 10–4 N on it. What is the charge of the positive object in coulombs?
4.0 x 10^-6 C
400
A potential difference of 10.0 volts exists between two points, A and B, within an electric field. What is the magnitude of charge that requires 2.0 × 10–2 joule of work to move it from A to B?
2.0 × 10–3 C
500
A negatively charged rod is placed in a pile of paper confetti. First, the confetti is attracted to the rod, then it starts jumping off the rod. Explain what is happening in terms of electron flow.
As the confetti approaches the rod the electrons shift away from the rod, changing the paper's charge distribution. The change in distribution created a positive Coulomb force that attracts the paper to the rod. Then the electrons from the rod transfer to the confetti, giving the confetti a negative charge. This causes the confetti to repel.
500
Look at the five different electroscope diagrams shown on the powerpoint. If I am using a negative rod to charge the electroscope. Which electroscope is charged by induction and which electroscope is charged by conduction?
Electroscope C is charged by conduction and electroscope B is charged by induction.
500
Look at the five different electroscope diagrams shown on the powerpoint. If the electroscope is charged negatively which electroscope shows a negatively charged item? Which electroscope shows a positively charged item.
Electroscope D shows a negatively charged item. Electroscope A shows a positively charged item.
500
What does the direction of an electric field indicate?
The direction of the net force on a positive particle.
500
How much force is needed to to move 100 Coulombs 2 meters through a potential difference of 12 Volts?
600 Newtons
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