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Question

Which of the following forces do not require physical contact with the body?
  1. Muscular force
  2. Magnetic force
  3. Gravitational force
  4. Frictional force


Solution

The correct options are
B Magnetic force
C Gravitational force
Magnetic force and gravitational force are non-contact forces. They do not require any physical contact to impart an effect. For instance, the Moon experiences an attractive force towards Earth due to gravity even though there is no physical contact between them. Also, unlike poles of magnet kept close to each other repel.

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