Consider the following statements:

The force per unit length between two stationary parallel wires carrying (steady) currents _____.

A. is inversely proportional to the separation of wires

B. is proportional to the magnitude of each current

C. satisfies Newton's third law

Out of this _____.

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SSC JE EE Previous Year Paper 17 (Held On: 4 March 2017 Evening)
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  1. A and B are correct
  2. B and C are correct
  3. A and C are correct
  4. A, B and C are correct

Answer (Detailed Solution Below)

Option 4 : A, B and C are correct
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Detailed Solution

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The force between two current-carrying parallel conductors:

  • Two current-carrying conductors attract each other when the current is in the same direction and repel each other when the currents are in the opposite direction
  • Force per unit length on conductor

\(\frac{F}{l}=~\frac{{{\mu }_{0}}}{2\pi }\frac{{{i}_{1}}{{i}_{2}}}{d}\)

It satisfies Newton’s third law.
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