Three +3.0-?C point charges are at the three corners of a square of side 0.50 m. The last corner is occupied by a -3.0-?C charge. Find the magnitude of the electric field at the center of the square. (k = 1/4??0 = 8.99 × 109 N ? m2/C2)
What will be an ideal response?
4.3 × 105 N/C
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Total constructive interference occurs when two waves with similar frequency and wavelength
A) are completely out of phase. B) are completely in phase. C) have 45 degrees phase difference. D) have 90 degrees phase difference. E) have a phase difference of -90 degrees.
Two particles whose charges have equal magnitudes q but opposite signs are placed as shown. The reference point for zero potential is infinity. 
At which labeled point is the potential largest?
A. A B. B C. C D. D E. E F. None of the labeled points
Suppose you receive a message from a starbase that is 13.0 light-years from earth. The message is dated July 15, 2127. What year does your calendar indicate at the time of reception if your calendar and the station’s calendar are correctly synchronized?
A. 2127 B. 2114 C. 2140 D. Other (specify)
When a 20.0-ohm resistor is connected across the terminals of a 12.0-V battery, the terminal voltage of the battery falls 0.30 V. What is the internal resistance of this battery?
A) 3.60 ? B) 1.56 ? C) 0.98 ? D) 0.30 ? E) 0.51 ?