P3.1.1 ELECTROSTATICS Flashcards
(22 cards)
what does attract mean?
what two objects of opposite charges do
what does repel mean?
what two objects of the same charge do
what does negative mean?
the type of charge that can be moved
what does neutral mean?
when objects have no overall charge
what does insulator means?
when a charged object make makes another object charged
what does induced mean?
the property that all objects have to have to be charged
what’s the relative mass and charge for neutrons?
1
0
what’s the relative mass and charge for protons?
1
+1
what’s the relative mass and charge for electrons?
0.0005
-1
how does rubbing an acetate rod with a cloth cause the rod and cloth to become charge?
because when the duster is rubbed on the plastic rod thermal energy is produced due to friction. this gives the electrons in the shells of the atoms in the rod enough energy to move to the duster. this means the rod is positively charged and the duster is negatively charged
what do these do
+ <— —> +
repel
what do these do
+ —> <— -
attract
what do these do
- <— —> -
repel
when a charged object is moved near a neutral insulator what happens to the electrons?
the electrons in the neutral object are moved . this can induce a charge in the object
what does the balloon and jumper drawing show?
the induced charge in the balloon and jumper example show the negative charges in the wall pushing away and the positive charge is induced on the wall
why can earthed objects not become charged?
because excess charge moves to the earth before it can build up and excess negative charge is repelled down the wire to earth
what are earthed objects connected to the ground by?
a conductor
what would happen if the object had excess positive charge?
excess negative charge would be attracted to the wire from earth
is there a force of attraction between the acetate rode and the cloth and why?
no because there is no force of attraction between two masses
if the amount of charge on the metal dome of the Van de Graaff generator is increased what happens to the potential difference between the metal dome an the earthed sphere?
when the potential difference is 60kV and the charge is 0.000025 what is the energy transfer?
60 x 0.000025
what is the equation for energy transfer?
charge x potential difference
