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Q. No.A simple pendulum is made with a thin wire (length: \(l,\) area: \(A,\) Young's modulus: \(Y\)) attached to a heavy bob of mass \(M.\) The pendulum is released from the rest with the bob at the same level as the point of suspension and swings down in a circular arc. The elongation in the wire when the bob reaches the lowest point is:
| 1. | \(\dfrac{3 M g l}{A Y}\) | 2. | \(\dfrac{2 M g l}{A Y}\) |
| 3. | \(\dfrac{3 M g l}{2 A Y}\) | 4. | \(\dfrac{M g l}{A Y}\) |
Subtopic: Â Hooke's Law |
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Elastic forces are:
| 1. | always conservative |
| 2. | not always conservative |
| 3. | never conservative |
| 4. | none of the above |
Subtopic: Â Hooke's Law |
From NCERT
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Q. No.
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