In order for it to rain, there must be
A) condensation nuclei, updrafts, and thick clouds.
B) sufficient vertical cloud development.
C) wind.
D) droplet bombardment.
Answer: A
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Dielectrics: When a dielectric material is introduced between the plates of a parallel-plate capacitor and completely fills the space, the capacitance increases by a factor of 4. What is the dielectric constant of the material that was introduced?
A. 0.4 B. 1/4 C. 2 D. 4 E. None of the other choices is correct.
Seen from the northern latitudes (mid-northern hemisphere), the star Polaris
a. is never above the horizon during the day. b. always sets directly in the west. c. is always above the northern horizon. d. is never visible during the winter. e. is the brightest star in the sky.
Terminal Voltage and Internal Resistance: A battery you buy at the store has an internal emf of 3.0 V. If it has an internal resistance of 14.0 ?, that current will this battery put out if it is short-circuited?
A. 0.21 A B. 42 A C. 4.7 A D. 130 A
A uniform electric field 
is present in the region between infinite parallel plane plates A and B and a uniform electric field 
is present in the region between infinite parallel plane plates B and C. When the plates are vertical,
src="https://sciemce.com/media/2/ppg__cognero__Chapter_25_Gauss_apos_s_Law.__media__74c2e226-f250-4ef7-96dc-c383b4ea77d7.PNG" style="font-family:'times new roman';vertical-align:middle;" /> is directed to the right and to the left. The signs of the charges on plates A, B and C may be
A. ?, ?, ?.
B. +, ?, ?.
C. +, ?, +.
D. +, +, +.
E. any one of the above.