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The time T, taken for a complete oscilla...

The time T, taken for a complete oscillation of a single pendulam with length l, is given by the equation `T= 2pi sqrt(l/g)`, where g is a constant. Find the approximate percentage error in the calculated value of T corresponding to an error of 2 percent in the value of l.

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The correct Answer is:
`T = 1/2 xx2 =1%`
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