In Fig. 21-25,four particles form a square. The charges are q1 # q4 # Q and q2 # q3 # q. (a) What is Q/q if the net electrostatic
force on particles 1 and 4 is zero? (b)
Is there any value of q that makes the
net electrostatic force on each of the
four particles zero? Explain.

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Light that is polarized along the vertical direction is incident on a sheet of polarizing material. only 96% of the intensity of the light passes through the sheet and strikes a second sheet of polarizing material. no light passes through the second sheet. what angle does the transmission axis of the second sheet make with the vertical?

How are the crust and the inner core alike? a) they are both solid. b) they both have the same temperature. c) they are both under the same pressure. d) they are both very close to the center of the earth.