Q145 / 180 · AIIMS 2017 · Physics

Assertion : Work done in moving a body over a closed loop is zero for every force in nature. Reason : Work done does not depend on nature of force.

  • A
    If both assertion and reason are true and reason is the correct explanation of assertion.
  • B
    If both assertion and reason are true but reason is not the correct explanation of assertion.
  • C
    If assertion is true but reason is false.
  • Correct answer
    D
    If both assertion and reason are false.

Solution

Work done in the motion of a body over a closed loop is zero only when the body is moving under the action of conservative forces (like gravitational or electrostatic forces). It is not zero when the forces are non-conservative e.g. frictional forces etc.

Hence, the correct answer is option: 'D'.

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