A galvanometer of 50 resistance has 25 divisions. A current of 4 10⁻⁴ A gives a deflection of one division. To convert this galvanometer into a voltmeter having a range of 25 V , it should be connected with a resistance of

Step-by-step solution

Given, resistance of galvanometer ( R _ g )=50 Number of divisions =25 I _ g =4 10⁻⁴ 25=10⁻² ~A R is the resistance connected in series of galvanometer to convert into voltmeter aligned V & =I_g (R_g+R ) 25 & =10⁻²(50+R) R & = 25 10⁻² -50=2500-50 R=2450 in aligned series.