Which of the following is non-conservative force?A. Electric forceB. Elastic forceC. Viscous forceD. Gravitational force

Conservative Force: A conservative force is one where the work done in moving an object between two points is independent of the path taken. In other words, the work done by a conservative force only depends on the initial and final positions of the object, not on the trajectory.
Examples of conservative forces include:
• Gravitational force
• Elastic (spring) force
• Electric force (in certain cases, like in an electrostatic field)
Non-conservative Force: A non-conservative force is one where the work done depends on the path taken. These forces usually lead to energy being dissipated, often in the form of heat or other forms of energy.
Examples of non-conservative forces include:
• Viscous force (which leads to friction and dissipation of energy as heat).
Explanation of the options:
1. Electric force (A):
o Electric force, when it is due to electrostatic fields, is a conservative force. The work done by electrostatic forces is path-independent and depends only on the initial and final positions of charges.
2. Elastic force (B):
o Elastic forces (such as those from a spring) are conservative. The work done by a spring depends only on the displacement from the equilibrium position, not the path taken.
3. Viscous force (C):
o Viscous force is a non-conservative force because it causes dissipation of energy (typically in the form of heat). The work done by viscous forces depends on the velocity of the object and the path it takes.
4. Gravitational force (D):
o Gravitational force is a conservative force because the work done in moving an object in a gravitational field only depends on the initial and final positions, not the path taken.
Conclusion:
The non-conservative force among the options is viscous force.
The correct answer is: C) Viscous force.