3. A)
Two point charges, -50 uC and +25 C, are separated by a distance of 15 cm as
shown in the figure. If a proton of charge 1.6 x 10-C is gently placed at point P, 5
cm from charge Q2, then determine the net electric force (magnitude and direction)
experienced by the proton
15 cm
[4]
х
-4.993 ES
-50 με
25 uc
Р
B)
Two conducting square plates 6.5 cm on a side and separated by 2.3 mm air gap
(dielectric constant of air gap is assumed to be 1) is fully charged with a 12.0 V
battery. The battery is then disconnected and a dielectric material of dielectric
constant 2.3 is inserted.
[6]
a)
b)
Determine the charge stored in each plate.
Determine the capacitance of the plates when dielectric material was inserted.
Determine the potential difference between the plates when battery was
disconnected and dielectric material was inserted.
c)

hi there!

your question asks at which segment does freezing occur.

since we're talking about water, the freezing point of water will be 32 degrees fahrenheit or below.

hope this ! ~

answer and explanation;

bacteria that live on the ocean floor are sustained by phytoplankton. phytoplankton, microscopic marine photosynthetic organisms, have a vastly significant role to play not only in the marine food web of which they’re part of, but also on a more global scale. despite their infinitely small size in comparison to other marine organisms, these tiny creatures occupy an immensely important ecological niche: they are the foundation of the marine food web, and as primary producers, play key roles in supporting all other organisms in the marine environment, as well as in the regulation of the earth’s climate through the sequestration of carbon, oxygen production, and other related processes. phytoplankton account for roughly half of all global primary productivity; therefore, their significance extends far beyond the marine environment alone. there is an intriguing sense of irony in the realization that these tiny living beings that often live out their existence unnoticed and undetected by the rest of the world, have such a far-reaching impact on the lives of virtually all other living organisms on the planet, particularly on those in the marine environment. the world that we have become accustomed to has been and is continuously shaped by the workings of these miniscule yet vital “plants of the sea”.

hope this !