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During an investigation of heat transfer, students poured equal amounts of water at different temperatures into two identical containers. The containers were then
sealed with a foam lid and a U-shaped aluminum bar was inserted into each liquid through the foam lids. The students placed a thermometer into each liquid to
monitor the temperature as shown in the diagram below.
Sample A
Sample
B
The temperature of the two liquids was recorded every 60 seconds. The graph above shows the data collected on the change in temperature of the two liquids
over 4 hours. It temperature data was collected for four more hours, which of the following should the students expect to observe and why?
09:52

To understand the behavior of the electric field at the surface of a conductor, and its relationship to surface charge on the conductor. a conductor is placed in an external electrostatic field. the external field is uniform before the conductor is placed within it. the conductor is completely isolated from any source of current or charge. part a: which of the following describes the electric field inside this conductor? it is in the same direction as the original external field.it is in the opposite direction from that of the original external field.it has a direction determined entirely by the charge on its surface.it is always zero. part b: the charge density inside the conductor is: 0non-zero; but uniformnon-zero; non-uniforminfinite part c: assume that at some point just outside the surface of the conductor, the electric field has magnitude e and is directed toward the surface of the conductor. what is the charge density η on the surface of the conductor at that point? express your answer in terms of e and ϵ0