A charge of \(8~\text{mC}\) is located at the origin. The work done in taking a small charge of  \(-2\times 10^{-9}~\text C\) from a point \(P (0, 0, 3~\text{cm})\) to a point \(Q (0, 4~\text{cm}, 0),\) via a point \(R (0, 6~\text{cm}, 9~\text{cm})\) is:
1. \(3.27~\text J\)
2. \(1.27~\text J\)
3. \(0.27~\text J\)
4. \(2.70~\text J\)

Subtopic:  Electric Potential Energy |
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In a hydrogen atom, the electron and proton are bound at a distance of about \(0.53~\mathring{A}\). The potential energy of the system in \(\text{eV}\) is:
(taking the zero of the potential energy at an infinite separation of the electron from the proton.)
1. \(-23.1~\text{eV}\)
2. \(27.0~\text{eV}\)
3. \(-27.2~\text{eV}\)
4. \(23.7~\text{eV}\)
Subtopic:  Electric Potential Energy |
 70%
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To view explanation, please take trial in the course.
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