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02 2005.10.21

# 02 2005.10.21 - Physics 122 Exam 2 Name Section 1 Two...

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Physics 122 10/21/05 Exam 2 Name_________________________________ Section______________ 1. Two charges q 1 (=+4/9 nC) and q 2 (=-4/3 nC) are located at opposite corners of a rectangle as shown. (I’ve added a coordinate system.) a. On the diagram, draw and label a vector E 1 that represents the electric field due to q 1 at the point in space labeled P (the top left corner of the rectangle). Draw a vector E 2 that represents the electric field due to q 2 at the same point in space P. Be sure to clearly show their directions and relative magnitudes. (2 points) b. Find the magnitude and direction of the electric field at P. (Indicate direction by determining the angle that the electric field at P makes with the positive x-axis. Just express the angle as the inverse function of a trig function – like φ = cos -1 (0.5).) (8 points) c. Find the electric potential at P. (6 points) d. Find the magnitude of the force on a -0.1 nC charge placed at P. (2 points) e. Find the potential energy of a -0.1 nC charge placed at P. (2 points) 2.0 m 1.0 m P q 1 q 2 x y

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Name_________________________________ Section______________ Page 2 of 4 2. An infinitely long insulating cylinder of radius
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02 2005.10.21 - Physics 122 Exam 2 Name Section 1 Two...

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