State $Ohm's$ law. Calculate the resistance of a conductor,if the current flowing through it is $0.2 \, A$ when the applied potential difference is $0.8 \, V$.

  • A
    $4 \, \Omega$
  • B
    $0.16 \, \Omega$
  • C
    $0.4 \, \Omega$
  • D
    $2 \, \Omega$

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