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JEE Main202331 Jan 2023Morning ShiftPhysicsGravitationActual

Spherical insulating ball and a spherical metallic ball of same size and mass are dropped from the same height. Choose the correct statement out of the following Assume negligible air friction

Options

  1. ATime taken by them to reach the earth's surface will be independent of the properties of their materials
  2. BInsulating ball will reach the earth's surface earlier than the metal ball
  3. CBoth will reach the earth's surface simultaneously
  4. DMetal ball will reach the earth's surface earlier than the insulating ball

Correct answer

B. Insulating ball will reach the earth's surface earlier than the metal ball

Step-by-step solution

When a spherical insulating ball and a spherical metallic ball of same size and mass are dropped from the same height, then magnetic field will act on metallic ball. If the earth's magnetic field is taken into account, then an induced eddy current will form inside the spherical metallic ball, thus retarding its motion. Hence, it will take more time than insulating ball.

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