1 .		In the above figure, if Q1 is negative and has magnitude less than Q2 which is positive, where could a positive charge be placed and possibly have a zero net force on it? [Hint]   A   B   C   D   E
2 .		In the above figure, if Q1 and Q2 are positive, where could a negative charge be placed and have a vertically upward net force on it? [Hint]   A   B   C   D   E
3 .		In the above figure, if Q1 and Q2 are positive, where would the electric field be vertically upward ? [Hint]   A   B   C   D   E
4 .		In the above figure, if Q1 and Q2 are positive and the same size, where would the electric field be zero ? [Hint]   A   B   C   D   E   Not shown.
5 .		In the above figure, if Q1 is negative and Q2 is positive and are both the same magnitude, where would the electric field be zero ? [Hint]   A   B   C   D   E   Nowhere shown.
6 .		In the above figure, if Q1 is negative and Q2 is positive and the distance from Q2 to point C is 1/4 the distance between the charges, how many times greater than Q2 in magnitude must Q1 be for the electric field to be zero at C? [Hint]   4   10   16   20   25
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 1.0x106, what is the magnitude of the net electric field? [Hint]   zero   7.1x105   1.0x106   1.4x106   2.0x106
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 1.0x106. If Q1 is negative and Q2 is positive what is the direction of the net electric field at B? [Hint]   Vertical and up.   Horizontal and to the right.   Vertical and down.   Horizontal and to the left.
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 1.0x106. If both Q1 and Q2 are positive what is the direction of the net electric field at B? [Hint]   Vertical and up.   Horizontal and to the right.   Vertical and down.   Horizontal and to the left.
10 .		The figure above shows a metal shell surrounding a positive charge. What is the charge on the metal surface at b? [Hint]   negative   zero   positive
11 .		The figure above shows a metal shell surrounding a positive charge. Which of the following statements is true? [Hint]   The electric field at e is less than that at a and c.   The electric field at c is greater than that at a and e.   The electric field at c is less than that at a and e.   The electric field at e is greater than that at a.
12 .		In question 10 what would be the charge on the exterior surface (d)? [Hint]   negative   zero   positive
13 .		Four people tell you they have a negative charge of a certain value. Which one is not telling the truth? [Hint]   Mine is 1.90x10-18 Coulomb.   Mine is 1.6x10-18 Coulomb.   Mine is 1.92x10-18 Coulomb.   Mine is 2.4x10-16 Coulomb.
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]   8.6x10-19 C   8.6 nanoC   7.4x10-17 C   100 C
15 .		How many electrons would it take to make up a charge of minus one millionth of a Coulomb? [Hint]   100000   10000000   8x1042   6.25x1012