The figure shows an equilateral triangle ABC. A positive point charge +q is located at each of the three vertices A, B, and C. Each side of the triangle is of length a. A point charge Q (that may be positive or negative) is placed at the mid-point between B and C.
Answer : No, because a fourth charge would be needed to cancel the force on Q due to the charge at A.
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An electron is fired through a pair of deflection plates, which produce a 2.00 cm long region with an electric field of 4000 N/C perpendicular to the electron's initial velocity. If the initial speed of the electron is 
what angle will its new velocity make with the direction of the original velocity?
A. 14
B. 8.0
C. 5.5
D. 4.6
D. 4.6
An ideal, reversible refrigerator keeps food in the freezer portion 
and dumps excess heat into the kitchen, whose temperature is 
What is the refrigerator’s coefficient of performance under these conditions?
A. 7.4 B. 4.0 C. 8.4 D. 2.1
Negatively charged subatomic particles are known as:
a. neutrons b. protons c. electrons d. elements e. atoms
How many neutrons are in a 
nucleus?
A. 79 B. 179 C. 118 D. Some other number (specify)