A proton, moving north, enters a magnetic field of a certain strength. Because of this field the proton curves downward. What is the direction of the magnetic field?
A) downward
B) upward
C) towards the east
D) towards the west
E) towards the north
C
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Identify a true statement about quasars
A) Their spectra are similar to the spectra of stars. B) Their spectra do not show any redshift. C) They exhibit fluctuations in their brightness over time scales of hours or minutes. D) They are supermassive structures with a diameter of 20 to 50 Mpc.
The thermal coefficient of linear expansion of Copper is 1.7 × 10-5 C°-1. What is the thermal volume expansion coefficient?
What will be an ideal response?
Three +3.0-?C point charges are at the three corners of a square of side 0.50 m. The last corner is occupied by a -3.0-?C charge. Find the magnitude of the electric field at the center of the square. (k = 1/4??0 = 8.99 × 109 N • m2/C2)
What will be an ideal response?
The post-Newtonian age began in 1900 when
A) Einstein introduced the general theory of relativity. B) Maxwell introduced electromagnetic waves. C) Michelson declared the Newtonian age was over. D) Einstein introduced the special theory of relativity. E) Max Planck introduced the quantum of energy.