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JEE Main 2023 (25 Jan, Shift 1) · Simple Pendulum

Simple Pendulum question from JEE Main 2023 (25 Jan, Shift 1)

Q43JEE Main 2023 · 25 JAN · SHIFT 1Easy

Simple Pendulum

T is the time period of simple pendulum on the earth's surface. Its time period becomes xx T when taken to a height R (equal to earth's radius) above the earth's surface. Then, the value of xx will be:

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Answer: (c)

  1. At height h=Rh = R: g′=g(1+h/R)2=g4g' = \frac{g}{(1 + h/R)^2} = \frac{g}{4}.
  2. T∝1g⇒T′=T4=2TT \propto \frac{1}{\sqrt{g}} \Rightarrow T' = T\sqrt{4} = 2T
  3. So the answer is (c) x=2x = 2.
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