A metal sphere of radius 10 cm carries a charge of +2.0 ?C uniformly distributed over its surface. What is the magnitude of the electric field due to this sphere at a point 5.0 cm outside the sphere's surface? (k = 1/4??0 = 8.99 × 109 N ? m2/C2)
A) 4.0 × 105 N/C
B) 8.0 × 105 N/C
C) 4.2 × 106 N/C
D) 4.0 × 107 N/C
E) 8.0 × 107 N/C
Answer: B
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Fill in the blank(s) with the appropriate word(s).
In a series circuit consisting of a 12.0 emf, a 2.00 mF capacitor, a 1.00 k
resistor and a switch, what is the voltage across the capacitor at a time 
after the switch is closed?
A. .632 V B. 6.32 V C. 7.58 V D. 8.65 V
The amplitude of a system moving with simple harmonic motion is doubled. The total energy will then be
a. 4 times as large. b. 3 times as large. c. 2 times as large. d. the same as it was. e. half as much.
A 120-V rms voltage at 1.00 kHz is applied to a resistor and an inductor in series. If the impedance of this circuit is 110 ?, what is the maximum value of the current?
A) 1.54 A B) 1.04 A C) 1.84 A D) 1.09 A