At which point of the Earth is there no gravity?

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IB ACIO Grade-II Official Paper-I (Held On: 23 Sep, 2012)
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  1. At North and South Pole
  2. At equator
  3. On the ocean surface
  4. At centre of the Earth

Answer (Detailed Solution Below)

Option 4 : At centre of the Earth
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Detailed Solution

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The correct answer is At the centre of the Earth.

  • The centre of the Earth is such that if we are at that place, the mass around us can be considered to be condensed at the surface of the Earth itself, i.e considering the Earth as a spherical shell.
  • Inside a spherical shell, there is no change in potential as one moves inside, and since only a change in potential implies a force there is no force.
  • Hence the acceleration due to gravity is zero at the centre of the Earth.

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