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Class 12 Physics Practice Test: Potential Energy of a System of Charges
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Avg score: 64% • Most missed: “+q charges are placed at the points (1, 0), (2, 0), (4, 0), (8, 0) …. (up to inf…”
Class 12 Physics Practice Test: Potential Energy of a System of Charges
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7 Questions

1. +q charges are placed at a, 3a, 5a… (up to infinity) and –q charges are placed at 2a, 4a, 6a….. (up to infinity). What is the total potential energy at origin (0, 0)?
2. Four point charges 2*10-9C, 1*10-9C, -2*10-9C, 3*10-9C are placed at the corners of a square of side length √2m. What is the electric potential at the center of the square?
3. If three equal charges are placed at the corners of an equilateral triangle, the potential at the center of the triangle will be zero.
4. The work done to move a charge of 20C by a distance of 2cm is 2J. What is the potential difference between those two points?
5. +q charges are placed at the points (1, 0), (2, 0), (4, 0), (8, 0) …. (up to infinity). What is the potential at the origin due to these charges?
6. What is the potential energy at the center of an equilateral triangle if +5esu, +5esu and -10esu are placed at the corners of the triangle? The triangle has a side length of √3cm.
7. .What should be the value of Q so that the potential energy of the system is zero?
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