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- 1. Multiple Choice
Two negative point charges are a distance 𝑥 apart
and have potential energy 𝑈. If the distance between
the point charges increases to 3𝑥, what is their new
potential energy?
9𝑈
3𝑈
𝑈
𝑈/3
𝑈/9
- 2. Multiple Choice
A negative 5 μ𝐶 charge is located 0.5 m from a positive 10 μ𝐶 charge as shown below. At how many positions (excluding infinity) on a line passing through both charges is the electric potential equal to zero?
0
1
2
3
- 3. Multiple Choice
Two, point charges, 𝑄1 = +3μ𝐶 and 𝑄2 = −3μ𝐶, are situated as shown in the figure below. Which point has the lowest potential?
A
B
C
D
E
- 4. Multiple Choice
In the figure below, two small spheres, each with charge + Q, are fixed in place at the corners of an equilateral triangle. Point I is at the third corner, and point II is midway between the charges.
A small particle with charge +q where 𝑞 << 𝑄, is moved from point I to point II at constant speed 𝑣 by an external force. Wext is the work done by the external force on the moving charge, and Welec( is the work done by the electrostatic force. Which of the following correctly identifies the signs of these quantities?
Wext + Welec -
Wext + Welec +
Wext - Welec -
- 5. Multiple Choice
The point with higher potential is
I
II
- 6. Multiple Choice
The unit (units) of electric field:
V/m
N/C
J/C
N/V
- 7. Multiple Choice
The highest electric field is at the point
A
B
C
D
- 8. Multiple Choice
The two points in the figure, in which a positive charge can move between them due to electric force only. Are:
D to B
C to A
A to B
B to D
- 9. Multiple Choice
V= 3x^2
the electric field is:
-6x
6x
-x^3
x^3
- 10. Multiple Choice
In which cases (points) the electric potential (V) = 0
When there are no charges in the region.
At Infinity. (r= Infinity)
At a point near + and - charges and their potential cancel each other
At the midpoint of 2 positive charges.
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