If the distance between two parallel current carrying conductors is tripled, then the magnitude of force between them will become _______. 

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SSC JE Electrical 14 Nov 2022 Shift 3 Official Paper
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  1. six times
  2. one-third
  3. one-sixth 
  4. three times

Answer (Detailed Solution Below)

Option 2 : one-third
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Detailed Solution

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Concept

Consider two parallel conductors with current 'I' flowing in them kept at a distance 'd' apart.

The force produced between two parallel current-carrying conductors is given by:

The force is directly proportional to the current flowing in the conductor

And is inversely proportional to the distance between the conductors

∵ 

If distance 'd' is tripled, then the magnitude of the force between them will become one-third.

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