Q122 / 200 · NEET 2010 (Screening) · Physics

A galvanometer has a coil of resistance $100 \Omega$ and gives a full scale deflection for $30 \mathrm{~mA}$ current. If it is to work as a voltmeter of $30 \mathrm{~V}$ range, the resistance required to be added will be

  • Correct answer
    A
    $900 \Omega$
  • B
    $1800 \Omega$
  • C
    $500 \Omega$
  • D
    $1000 \Omega$

Solution

Required resistance $R=\frac{V}{i_g}-G$ $$ =\frac{30}{30 \times 10^{-3}}-100=900 \Omega $$

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

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