Electric Charge
These charges repel each other.
Like charges
This is the name of the equation that we use to calculate the electric force on a charge.
Coulomb's Law
This is the unit for electric field
Newtons/Coulomb
Given two charges, q1=5x10-6C and q2=2x10-6C that are separated by 0.1m, what is the magnitude of the electric force between the two charges?
9N
__________ is a type of material behaves somewhere in between a conductor and an insulator
Semiconductor
When 2 objects are rubbed together, which type of charge moves from one source to the other?
Negative charge/electron
What does r represent in Coulomb's Law? What are its units?
separation distance between charges
meters
If two charges that are initially 2m apart are moved to a distance of 6m apart, by what factor does the resulting electric force between them change?
1/9
The direction of electric field is the same as the direction of the electric force that would be exerted on a small _______________ test charge.
What method of charging a material works for conductors but not insulators.
Charging by induction.
What are the two things that effect the strength of an electric force?
strength of charges and distance
Which is the most correct statement regarding the drawing of electric field lines?
(A)Electric field lines always connect from one charge to another.
(B) Electric field lines always form closed loops.
(C) Electric field lines can start on a charge of either polarity.
(D) Electric field lines never cross each other.
D
What is the charge for an object consists of +200e?
3.2x10-17C
A grounded conductor may be charged by the process of ______________ when a charged object is brought near the conductor.
induction
What does it mean for electric charge to be quantized?
It exists in discrete integer units of a fundamental charge.
If sphere A has a charge of -3.0x10-6C and sphere B has a charge of
-6.0x10-6C, which object experiences a greater force?
The same due to Newton's 3rd Law
If there is a negative charged object, what are the directions of the electric field, the force on proton, and force on electron?
The electric field and force on proton is direct towards the negative charged object while the force on electron is directed away from the negative charged object.
Two positive charges, each of magnitude q, are on the x-axis at points x=+a and x=-a Where would a third positive charge of the same magnitude be located for the net force on the third charge to be zero?
at the origin
The electric force is a ________ force
field
Who discovered that electric charge is quantized? (both first name and last name)
Robert Millikan
What are the units for Coulomb's constant?
N*m2/C2
Name 3 properties of Electric Field Lines
1. Electric field lines never cross each other
2. The direction of force on a small positive test charge out of positive into negative.
3. Number of field lines represent relative field strength
Two spheres having charges of +10C and -6C, respectively, attract each other with a force F. If another uncharged sphere touches the first sphere, and later the second sphere, what is the new force between the first two spheres? The separation between the two spheres remains the same.
F/24
When the net external force acting on a body is zero, the object is in _______________.
equilibrium