The plates of a parallel-plate capacitor are maintained with constant voltage by a battery as they are pulled apart. During this process, the amount of charge on the plates must
A)
increase.
B)
decrease.
C)
remain constant.
D)
either increase or decrease. There is no way to tell from the information given.
B
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When two arches in a magnetic field encounter each other, ____ can cause powerful eruptions called ____
a. solar winds; convective zones b. prominences; limb darkening c. filaments; coronal holes d. supergranules; Coulumb barriers e. reconnection events; flares
Two long parallel wires carry currents of 10 A in opposite directions
They are separated by 40 cm. What is the magnitude of the magnetic field in the plane of the wires at a point that is 20 cm from one wire and 60 cm from the other? (?0 = 4? × 10-7 T ? m/A) A) 1.5 µT B) 3.3 µT C) 6.7 µT D) 33 µT E) 67 µT
The characteristic strength of a group of tensile specimens corresponds to a probability of survival equal to _________.
Fill in the blank(s) with the appropriate word(s).
An important use of x-ray diffraction was:
a. the observation of Compton scattering. b. determining the structure of the DNA molecule. c. production of positrons. d. observation of the photoelectric effect.