If an electron is accelerated from rest through a potential difference of 100 volts. Its final Kinetic Energy is:
Correct answer: B. 1.6 × 10^-17J
- A. 1.6 × 10^-18J
- B. 1.6 × 10^-17J
- C. 100J
- D. 100 electron volt
Explanation
Kinetic Energy = Work done = Q x V = 1.6×10−19×100=1.6×10−17 Joules. This option is correct as seen from the following relation.
This question appeared on the ETEA MDCAT 2009 paper, which you can sit online with every answer explained.
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About Electric Potential
Electric potential is the work done per unit positive charge in bringing it from infinity to a point, while potential difference compares energy change between two points. Work includes potential due to point charges, superposition of scalar potentials, equipotential surfaces, and the relation between electric field and potential.
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