What is the direction of the electric field vector 
at point P in the situation shown below? (Assume that the balls are actually point particles with the same magnitudes of charge.)
A. A
B. B
C. C
D. D
E. zero
F. Other
G. AA
H. BB
I. CC
J. DD
B. B
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Answer the following statement true (T) or false (F)
Which of the following observations would not be likely to provide information about the final, explosive stages of a star's life?
A) decades of continuous monitoring of red giants in a globular cluster B) studying the light rings around Supernova 1987A in the Large Magellanic Cloud C) observing the structures of planetary nebulae D) neutrino detections from nearby supernovae
A 5.0-nC point charge is embedded at the center of a nonconducting sphere (radius = 2.0 cm) which has a charge of ?8.0 nC distributed uniformly throughout its volume. What is the magnitude of the electric field at a point that is 1.0 cm from the center of the sphere?
A. 1.8 × 105 N/C B. 9.0 × 104 N/C C. 3.6 × 105 N/C D. 2.7 × 105 N/C E. 7.2 × 105 N/C
The probability that a hydrogen atom's electron
will be at a certain distance from the proton is given by a) the principal quantum number of the electron. b) the electron's de Broglie wavelength. c) the binding energy of the electron. d) the square of the electron's Schrödinger wave function.