Multiple Choice Problems:
Please circle the correct answer below.
1)
In the figure, points A, B and C are the vertices of an equilateral triangle with
sides of length 10
-4
m. Positive charges of magnitude Q=1.1
x
10
-10
C are located at
points B and C. What is the direction of net electric force on electron residing at
point A?
.
A
.
B
.
C
↑
↓
9
→
←
2) A sphere has a net excess charge of 3.2 x 10
-19
C.
The sphere must have an excess of
_______.
1 Proton
1 Electron
2 Protons
9
2 Electrons
3) Two positive charges Q=1.1 x10
-10
C are located 10
-3
m from each other, and point P is
exactly between them. What is the magnitude of the electric field at point P?
0 N/C
9
10
6
N/C
2 x10
6
N/C
8x10
6
N/C
4) Two charges Q1 and Q2 are separated by distance d. How would the force exerted by
charge Q1 on charge Q2 change if the separation is increased by factor of 4?
Decrease by
factor of 16
9
Decrease by
factor of 4
Increase by factor
of 4
Decrease by
factor of 2
5) Four point charges of equal magnitude but varying sign are
arranged on corners of a square of side length
d
, as shown in the
figure to the right.
d
d
3
4
2
1
+q
+q
+q
Which of the arrows shown represents the net (or total) electric
field at the origin?
– q
1
2
3
9
4

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