A field in which the work done in moving a body in a closed path is zero is called:
Correct answer: B. conservative field
- A. (a) electric fied
- B. conservative field
- C. electromagnetic field
- D. gravitational field
Explanation
(a) Incorrect. Work can be done in electric fields, especially if the path is not closed.(b) Correct! In a conservative field, work done around a closed path is zero because the potential energy remains constant.(c) Incorrect. While electromagnetic fields include electric and magnetic fields, the property of zero work in closed paths specifically applies to conservative fields.(d) Not entirely accurate. While gravitational fields are conservative for certain distances, work can be done within a closed path depending on the path and mass distribution.
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Work transfers energy when a force causes displacement, while kinetic energy, gravitational potential energy and power describe motion, position and the rate of energy transfer. The work-energy theorem links net work with change in kinetic energy, and efficiency accounts for energy losses rather than treating them as energy destruction.
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