Practice Problems for Prelim I.docx - Practice Problems for Prelim I PHY 122 1 Look at the figure below Find the following a What is the electric field

# Practice Problems for Prelim I.docx - Practice Problems for...

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Practice Problems for Prelim I, PHY 122 1. Look at the figure below. Find the following: a. What is the electric field and electric potential at point A? b. What is the electric force and the electric potential energy of q1? c. What is the electric potential at point B? d. Move a charge of 2µC and 0.9 kg from point A to point B. How much work did the electric field do on this charge? e. Assuming the 2µC charge started from rest, what is its velocity at point B? 2. Look at the two charges given below. Where between the charges is the electric field equal to zero? Is the electric potential also equal to zero at this point? 3. The point X and Y are both equidistant from a positively charged rod. If I move a charge Subscribe to view the full document. Unformatted text preview: of +q from X to Y, is the work done by the electric field due to the rod positive, negative, or zero? Give a reason for your answer. Q2 = 8x10-6 C Q1 = 6x10-6 C 0.3 m 0.4 m 0.4 m B A 0.3 m Q3 = 8x10-6 C 0.5x10-6 C 7x10-6 C 2m Y X 4. For a point charge, we derived an expression from Gauss’s law for the electric field a distance r away. You have a point charge of +2q centered in a conductive spherical shell of inner diameter a and outer diameter b. You place +8q on the spherical shell. Find the following: a. What is the electric field for r&lt;a? b. What is the electric field for a&lt;r&lt;b? c. What is the electric field for r&gt;b? d. What is the CHARGE on the inner radius of the shell?...
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• Spring '06
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