
1 . 

In the above figure, if Q_{1} is negative and has magnitude less than Q_{2} which is positive, where could a positive charge be placed and possibly have a zero net force on it? [Hint]


2 . 

In the above figure, if Q_{1} and Q_{2} are positive, where could a negative charge be placed and have a vertically upward net force on it? [Hint]


3 . 

In the above figure, if Q_{1} and Q_{2} are positive, where would the electric field be vertically upward ? [Hint]


4 . 

In the above figure, if Q_{1} and Q_{2} are positive and the same size, where would the electric field be zero ? [Hint]


5 . 

In the above figure, if Q_{1} is negative and Q_{2} is positive and are both the same magnitude, where would the electric field be zero ? [Hint]


6 . 

In the above figure, if Q_{1} is negative and Q_{2} is positive and the distance from Q_{2} to point C is 1/4 the distance between the charges, how many times greater than Q_{2} in magnitude must Q_{1} be for the electric field to be zero at C? [Hint]


7 . 

In the above figure if the vertical distance from point E to B is the same as the horizontal distance from E to either charge and the electric field at B from either charge has magnitude 1.0x10^{6}, what is the magnitude of the net electric field? [Hint]


8 . 

In the above figure the vertical distance from point E to B is the same as the horizontal distance from E to either charge and the electric field at B from either charge has magnitude 1.0x10^{6}. If Q_{1} is negative and Q_{2} is positive what is the direction of the net electric field at B? [Hint]


9 . 

In the above figure the vertical distance from point E to B is the same as the horizontal distance from E to either charge and the electric field at B from either charge has magnitude 1.0x10^{6}. If both Q_{1} and Q_{2} are positive what is the direction of the net electric field at B? [Hint]


10 . 

The figure above shows a metal shell surrounding a positive charge. What is the charge on the metal surface at b? [Hint]


11 . 

The figure above shows a metal shell surrounding a positive charge. Which of the following statements is true? [Hint]


12 . 

In question 10 what would be the charge on the exterior surface (d)? [Hint]


13 . 

Four people tell you they have a negative charge of a certain value. Which one is not telling the truth? [Hint]


14 . 

What must be the charge on each of two 100 kg spherical masses in order for the electrical force to equal the gravitational force? [Hint]


15 . 

How many electrons would it take to make up a charge of minus one millionth of a Coulomb? [Hint]


