State the general rule for the interaction of magnetic poles
Like poles repel; unlike poles attract.
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A comet near the Sun whose orbit is ____ would never be near the Sun again
a. apogee b. circular c. elliptical d. hyperbolic e. radial
Electric Field of Point-Charges: Three equal negative point charges -q are placed at three of the corners of a square of side d as shown in the figure. Which one of the arrows shown represents the direction of the net electric field at the vacant corner of the square?
A. A B. B C. C D. D
Which of the following molecules is the most abundant in molecular clouds?
A) CO B) H2O C) NH3 D) H2
A single slit is opened in an opaque barrier. Light is shone through the slit and the diffraction pattern is observed. If the slit is decreased in size to half its original size, by what factor does the width of the central diffraction maximum change?
A. decreases by a factor four B. Doubles C. Halves D. Increases four times