Two long parallel wires are at a distance of $1$ metre. Both of them carry one ampere of current. The force of attraction per unit length between the two wires is

  • [AIPMT 1998]
  • A

    $1\,N/m$

  • B

    $2 \times {10^{ - 7}}\,N/m$

  • C

    $1 \times {10^{ - 2}}\,N/m$

  • D

    $4\pi \times {10^{ - 7}}\,N/m$

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Assertion : Free electrons always keep on moving in a conductor even then no magnetic force act on them in magnetic field unless a current is passed through it.

Reason : The average velocity of free electron is zero.

  • [AIIMS 2016]