When a microwave filter consisting of vertical parallel metal rods is in the absorbing position, oscillating currents are set up in the rods. At any one instant, the current in each rod has the same magnitude and direction. At that instant
a. the rods will try to move apart horizontally.
b. the rods will try to move together horizontally.
c. the rods will try to shift vertically upwards.
d. the rods will try to shift vertically downwards.
e. the rods will not be affected because the source of current is not a battery.
b
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General relativity explains gravity as the ________ of spacetime
Fill in the blank(s) with correct word
Fossils that are useful in correlating rock layers are called
a. index fossils. b. trace fossils. c. range fossils. d. tracing fossils.
The electric field just outside the surface of a hollow conducting sphere of radius 20 cm has a magnitude of 500 N/C and is directed outward. An unknown charge Q is introduced into the center of the sphere and it is noted that the electric field is still directed outward but has decreased to 100 N/C. What is the magnitude of the charge Q?
A. 1.5 nC B. 1.8 nC C. 1.3 nC D. 1.1 nC E. 2.7 nC
According to the Bohr theory, the probability of finding a hydrogen atom's ground-state electron 0.053 nm from the proton is
a. low, but not zero. b. 100%. c. zero. d. high, but not 100%.