# ch28 - Some Review due to Quiz3 results A few questions...

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Some Review due to Quiz3 results A few questions were done VERY poorly

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2 16% of 108 students • Four charges of 6 μ C are at the corners of a square, which has sides of length 10 cm. What is the magnitude of the net force on the NE charge? • Please Answer to one decimal.
3 11% of 120 students • A -2 μ C charge is placed at the origin and a +8 μ C charge is placed at x = 10 cm. At what position should a charge be placed so that the force on it is zero? • Please answer in centimeters.

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4 18.5% of 135 • In which of the following figures would an electron placed on the dot feel zero net force?
5 27.5% of 204 • A 10 cm long thin glass rod uniformly charged to +10 nC and a 10 cm long thin plastic rod uniformly charged to -10 nC are placed side by side, 4.0 cm apart. What is the electric field strength at a distance of 2.0 cm from the glass rod along the line connecting the mid-points of the two rods?

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6 25.5% of 180 • A small segment of wire shown in the figure below contains 10 nC of charge. The segment is shrunk to one-third of its original length. A proton is very far from the wire. What is the ratio F f /F i of the electric force on the proton after the segment is shrunk to the force before the segment is shrunk? • Express your answer to one significant figure .
7 Chapter 28. Gauss’s Law The nearly spherical shape of the girl’s head determines the electric field that causes her hair to stream outward. Using Guass’s law, we can

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ch28 - Some Review due to Quiz3 results A few questions...

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