static charges test review
neutral silk is rubbed against a glass rod. The resulting charge on the silk is -9 mircoCoulombs. What is the charge on the rod?
+9
calculate the force exerted between two charged objects separated by a distance of 0.6m. One object has a charge of -5 C and the other has a charge of +2.0 C.
-2.5 E 11 N
if two identical charges are placed 4 m apart, what would the electric field be at the point directly between them?
0 N/C
1 volt is equivalent to what units?
1 J/C
which of the following is not a good conductor of electricity?
Glass
in and electric field, Point A has more electric field lines moving through it than Point B. Which is true?
Point B is further away
a region of influence surrounding an object is best defined as
a field
metals are great:
conductors
what happens to an electric force if the distance between charges is tripled?
decreases to 1/9
what variable do meters represent
distance
two like charges are brought each other. Which energy will the charges have before they begin to repel
electric potential energy
in insulators:
electrons cannot move easily
in a conducting material
electrons freely move around
what variable to Coulombs represent?
electrostatic charge
what variable do "newtons" represent?
force
how is electric force between two charges affected when both of the charges are doubled?
four times as much
how is the electric force between two charges affected when the distance between the charges is halved?
four times as much
when a ballon is rubbed on clothes it acquires a charge by
friction
negative electric charge is formed when an object:
gains electrons
eliminating excess charges by allowing them to escape to the earth is :
grounding
what happens to an electric force if one charge is quadrupled?
increases by 4
charging a neutral object by bringing a charged object near it is called:
induction
rubber and plastic are great:
insulators
if two like charges are brought near each other what type of energy will they have as they begin to repel?
kinetic energy
what is the unit for electric force?
newton
an atom loses an electron. what type of charge does it have now?
positive
_____________is stored energy
potential
if each of the charges doubles, what happens to the force?
quadruples
two like charges
repel each other
computers mostly use:
semiconductor
the energy that is stored in a capacitor is in the form of
the electric field between its plates
what is the definition of electric field strength?
the force per unit positive charge.
what will happen to the electrostatic force between 2 objects if the distance between them is quadrupled?
the force will decrease to 1/16 the original strength
what will happen to the electrostatic force if the charge of one particle is increased 6 times
the force will increase 6 times
Particle A has twice as much charge as particle B. Compared to the force on particle A from particle B, the force on particle B from particle A is
the same
what direction are the electric field lines around an electron
towards the charge
an electric field has both direction and magnitude True or False?
true
can energy be changed?
yes
if we surrounded our cell phone in aluminum the electric field inside would be...
zero
what is the force between two 1.5 x 10^-8 C charges separated by 3.4 m?
1.8 x 10 ^-7 N
the electrical force on a 2-C charge is 20 N. What is the value of the electric field at the location of the charge?
10 N/C
a 5-C charge is located near a positively charged sphere so that it had 50 J of electric potential energy
10 V
if you use 20J of work to push a 2-C charge into an electric field, its voltage with respect to its starting position is
10V
if you use 17 J of work to push a charge into an electric field and then release the charge, as the charge flies past its starting position, its kinetic energy is
17 J
Two spears are 5 cm apart with a force of 7x10^-6N. What is the new force if they are moved 2.5cm apart?
2.8x10^-5N
a 2 C charge experiences a force of 40 N when put at a location in space. The electric field at that location is
20 N/C
