Q145 / 180 · KCET 2015 · Physics

In the circuit shown below, the ammeter and the voltmeter readings are \( 3 \mathrm{~A} \) and \( 6 \mathrm{~V} \)
respectively. Then the value of the resistance \( R \) is
Figure

  • A
    - \( 2 \Omega \)
  • B
    \(R > 2 \Omega \)
  • Correct answer
    C
    \(R < 2 \Omega \)
  • D
    $2 \Omega$

Solution

Given, voltmeter reading \( =6 \mathrm{~V} \); ammeter reading \( =3 \mathrm{~A} \)
Using ohm's law, \( V=I R ; R=\frac{V}{I} \Rightarrow R=\frac{6}{3}=2 \Omega \)
This will be the case when ideal ammeter and voltmeter are used. Therefore, the value of resistance \( \mathrm{R} \) is less than \( 2 \Omega \),
that is \( R < 2 \Omega \)

Hence, the correct answer is option: 'C'.

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