Electric field lines can cross only if both positive and negative charges are involved
Indicate whether the statement is true or false
FALSE
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The speeds of 25 molecules are distributed as follows: 5 in the range from 2 to 3 m/s, 10 in the range from 3 to 4 m/s, 5 in the range from 4 to 5 m/s, 3 in the range from 5 to 6 m/s, 1 in the range from 6 to 7 m/s, and 1 in the range from 7 to 8 m/s. Their average speed is about:
A. 2 m/s B. 3 m/s C. 4 m/s D. 5 m/s E. 6 m/s
Mercury features long, steep cliffs in its crust called "scarps" which probably formed
A. by erosion from high solar winds. B. like giant wrinkles as the crust cooled and shrank. C. after impacts from a planetesimal or asteroid. D. as plates of crust shifted as a result of massive earthquakes at a fault. E. from floods of running water left to evaporate after comet impacts.
Color TV is produced by
A) cyan, magenta, and yellow beams of electrons merging at the screen. B) red, green, and blue beams of electrons merging at the screen. C) A single beam of electrons striking a triad of phosphors of red, green, and blue. D) A single beam of electrons striking a triad of phosphors of cyan, magenta, and yellow.
A 50-turn circular coil (radius = 15 cm) with a total resistance of 4.0 ? is placed in a uniform magnetic field directed perpendicularly to the plane of the coil. The magnitude of this field varies with time according to B = A sin (?t), where A = 80 ?T and ? = 50? rad/s. What is the magnitude of the current induced in the coil at t = 20 ms?
a. 11 mA b. 18 mA c. 14 mA d. 22 mA e. zero