If an electron moves in a magnetic field,
A. it always feels a force.
B. it only feels a force if its velocity vector is parallel (or antiparallel) to the direction of the magnetic field.
C. it does not feel a force if it is in motion, only if stationary.
D. it only feels a force if its velocity vector is not parallel (or antiparallel) to the direction of the magnetic field.
Answer: D
You might also like to view...
In the late 1800s, Kelvin and Helmholtz suggested that the Sun stayed hot due to gravitational contraction. What was the major drawback to this idea?
A) It predicted that the Sun would shrink noticeably as we watched it, but the Sun appears to be stable in size. B) It is physically impossible to generate heat simply by making a star shrink in size. C) It predicted that the Sun could shine for about 25 million years, but geologists had already found that Earth is much older than this. D) It predicted that Earth would also shrink in size with time, which would make it impossible to have stable geology on our planet.
The electric field of a point charge has an inverse ________ behavior
a. r1/2 b. r c. r2 d. r3
If star A is 14.5 times brighter than star B, then what is their magnitude difference?
a. 1.2 b. 2.9 c. 63.1 d. 800 e. 6.2 x 10^5
At absolute zero
A. all molecular motion is ceasing B. the pressure of an ideal gas is zero C. the volume of an ideal gas is zero D. the Celsius temperature is zero