Two parallel plates that are initially uncharged are separated by 1.7 mm, have only air between them, and each have surface areas of 16 cm2
How much charge must be transferred from one plate to the other if 1.9 J of energy are to be stored in the plates? (?0 = 8.85 × 10-12 C2/N ? m2)
A) 5.6 ?C
B) 4.0 ?C
C) 8.0 ?C
D) 0.60 mC
A
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A non-conducting sphere of radius R = 7 cm carries a charge Q = 4 mC distributed uniformly throughout its volume
At what distance, measured from the center of the sphere does the electric field reach a value equal to half its maximum value? A) 3.5 cm only B) 4.9 cm only C) 3.5 cm and 9.9 cm D) 3.5 cm and 4.9 cm E) 9.9 cm only
Whenever the net force on an object is zero, its acceleration
A) may be zero. B) is zero. C) and velocity are the same. D) none of the above
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What will be an ideal response?
An electron is in its lowest energy level when
a. it is free of nuclear forces. b. its momentum is zero. c. it is in its ground state. d. none of these.