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MCQEasyJEE 2023Motion in a Straight Line

JEE Physics 2023 Question with Solution

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

  • A

    Time taken by them to reach the earth's surface will be independent of the properties of their materials

  • B

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

  • C

    Both will reach the earth's surface simultaneously

  • D

    Metal ball will reach the earth's surface earlier than the insulating ball

Answer

Correct answer:B

Step-by-step solution

Standard Method

Given: A spherical insulating ball and a spherical metallic ball have the same size and mass and are dropped from the same height. Air friction is negligible.

Find: Which ball reaches the earth's surface first.

The solution states that the metallic ball experiences a force due to induced currents while passing through a magnetic field, making it slower than the insulating ball.

Therefore, the insulating ball reaches the earth's surface earlier.

The correct option is B.

Common mistakes

  • Assuming that same mass and same size always guarantee equal time of fall. That conclusion would hold only if no additional force acts differently on the two bodies. Always check whether the solution introduces any extra effect.

  • Choosing the option from basic free-fall intuition without reading the stated assumption or the provided solution logic. Use the governing effect mentioned in the solution before deciding the comparison.

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