question_answer 48)

  A multi range voltmeter can be constructed by using a galvanometer circuit as shown in Fig. 3(EP).3. We want to construct a voltmeter that can measure 2 V, 20 V and 200 V using a galvanometer of resistance 10  and that produces maximum deflection for current of 1 mA. Find  that have to be used.

Answer:

                  Here,      G= 10,  mA = Case (i), V = 2 V, = ? = Case (ii), V = 20 V, = ?                                          Case (iii), V = 200 V,= ?                 .