A galvanometer coil has a resistance of ( 50 ) and the meter shows full scale deflection for a current of ( 5 ~mA ), This galvanometer is converted into voltmeter of range ( 0-20 ~V ) by connecting

Step-by-step solution

We know, ( R= V I_ g -G ) Given, [ array l V=20 ~V ; I_ g =5 ~mA =5 10⁻³ ~A ; G=50 R= 20 5 10⁻³ -50= 20 0.005 -50=3950 array ] Therefore, the given galvanometer is converted into voltmeter of range ( 0-20 ~V ) by connecting ( 3950 ) in series with galvanometer.