Charge
A proton and a proton ________ each other
A proton and an electron ________ each other
A charged body is _______ to a neutral body
A neutral body is _______ by a neutral body
repel
attract
attracted
not effected
The charges that produce electric field lines have this unit for charge…
Coulombs
What is the unit for k constant?
Nm^2/C^2
Give 3 examples of conducting materials.
Metals, sea water, human body.
What is the charge of 12 protons? (show correct units)
+1.92 x 10^-18 C
A charged object A is brought near a neutral object B. A attracts B, and B doesn't attract A since B is neutral.
True or false? Explain using physics principles.
False. According to Newton's 3rd law the attractive force should be mutual.
What is the value of charge for object A if the electrostatic force between A and B is 1.38 x 10^-20 Newtons, the charge of object B is -8.0 x 10^-19 Coulombs and the distance between object A and B is 5.0 x 10^-4 meters?
-4.8 x 10^-19 Coulombs
Why electrical wires are coated by rubber or plastic shielding?
To prevent electric current flow through human body to the ground (electric shock).
Rutherford's experiment revised the previous atomic model (Plum Pudding model).
What does the result say about position of positive and negative charges?
Protons (positive charges) and neutrons are sitting in the center as nucleus, taking a tiny portion of space.
Electrons (negative charges) are loosely bounded to the outside of an atom, occupying most of the space.
If you double the charge of one body, keep the other charge the same, and keep the distance the same, what happens to the electrostatic force…
It doubles.
What is the electrostatic force between a +1.45nC charge and a -1.45nC charge at a distance of 0.25 meter from one another? Is it also attractive or repulsive?
Attractive force of -3.024x 10^-7 Newtons
When a conductor is charged, charges distribute ___________.
When an insulator is charged, charges distribute __________.
When a conductor is charged, charges distribute uniformly and seperate over the entire surface.
When an insulator is charged, charges stay where they are charged.
Glass. Because it has a greater tendency to lose electrons than cotton.
How does the force change when both charges are doubled, and the distance is doubled…
The force remains the same
What is the electrostatic force between two protons separated at a distance of 2.61 x 10^-4 meters…
3.38 x 10^-21 Newtons
What protects humans from a lightening bolt if they are sitting in the car...
The metal frame of the car (conducts the electricity away from the inside)
How many more electrons than protons are carried by a charged object of -380 pC?
2.375*10^9 more electrons.
Explain why neutral water stream will deflect when a positively charged rod is nearby.
Induction.
The water molecules become polarized so that negative charges turn and become closer to the rod. The attractive force is greater than the repulsive force since negative charges are closer.
Protons within a nucleus should feel incredibly large repulsive force given that they are very close. Why don't they fly apart due to repulsion?
Because another type of interaction, strong interaction, holds the nucleus together.
You have a positively charged rod.
How do you charge a neutral object to be negatively charged?
Use a grounding wire with the object.
Bring the (+) rod near the object but not touching.
Remove the grounding wire.
Remove the (+) rod.