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Q56
(CDS-II/2026)
Science & Technology › Basic Science (Physics, Chemistry, Biology)
A rod is balanced vertically on one of its ends. Which one among the following is the correct nature of its state of equilibrium ?
Result
Your answer:
—
·
Correct:
C
Explanation
A body is in unstable equilibrium if, when slightly displaced, it tends to move further away from its original position. For a rod balanced vertically on its end, the center of gravity is at its highest possible point relative to the base of support. Any small displacement causes the center of gravity to lower and moves the line of action of the weight outside the base of support. This creates a torque that causes the rod to fall further, rather than returning to its original vertical position.
- Stable equilibrium: The body returns to its original position after a slight disturbance (e.g., a rod lying flat).
- Neutral equilibrium: The body remains in its new position after being disturbed (e.g., a cylinder rolling on a horizontal surface).
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