A point charge Q is placed on the x axis at x = ?2.0 m. A second point charge, ?Q, is placed at x = 1.0 m. If Q = 60 ?C, what is the magnitude of the electrostatic force on a 40-?C charge placed at the origin?
A. 16 N
B. 27 N
C. 32 N
D. 11 N
E. 3.0 N
Answer: B
You might also like to view...
The lowest amount of solar energy per square meter is incident upon the surface of Earth in the northern hemisphere on or about
a. December 21, the winter solstice. b. March 21, the vernal equinox. c. September 21, the autumnal equinox. d. June 21, the summer solstice.
Components: If a vector 
has components Ax < 0, and Ay < 0, then the angle that this vector makes with the positive x-axis must be in the range
A. 0° to 90°. B. 90° to 180°. C. 180° to 270°. D. 270° to 360°. E. It cannot be determined without additional information.
A blacksmith is flattening a steel plate having dimensions 10 cm × 15 cm × 1 mm. He has heated the plate to 900 K. If the emissivity of the plate is 0.75,
at what rate does it lose energy by radiation? Ignore any heat exchange with the surroundings. (? = 5.67 × 10-8 W/m2 ? K4 ) A) 360 W B) 760 W C) 790 W D) 850 W E) 880 W
What is the potential difference Vb ? Va shown in the circuit below
a.
?8.0 V
b.
+8.0 V
c.
?18 V
d.
+18 V
e.
?12 V