When there is electric current through an ionic liquid such as salty water, the moving charges are
A) only protons.
B) only electrons.
C) only negative ions.
D) only positive ions.
E) both positive and negative ions.
E
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A thin metallic shell of radius 40 cm has a charge of -25 nC on it. At the center of the sphere is a point charge of 35 nC. What is the electric field 15 cm from the center of the shell?
a. 
b. 
c. 
d. 
e. 
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Answer the following statement true (T) or false (F)
A brick is resting on a rough incline as shown in the figure. The friction force acting on the brick, along the incline, is
A) zero. B) equal to the weight of the brick. C) greater than the weight of the brick. D) less than the weight of the brick.
What is the maximum value of the electric field E at 1.5 m from a 102-W light bulb radiating in all directions? (µ0 = 4? × 10^?7 T?m/A, c = 3.00 × 10^8 m/s)
a. 5.2E+1 V/m b. 4.1E+3 V/m c. 2.7E+3 V/m d. 8.5E+2 V/m e. 3.2E+2 V/m