A galvanometer coil has a resistance 80 and current for full-scale deflection is 10 mA . A resistance of 920 is connected in series with the galvanometer to make a voltmeter. If the least count of the voltmeter is 0.2 V , the number of divisions on the scale is

Step-by-step solution

Determining the number of divisions on the voltmeter scale requires calculating the maximum measurable voltage and relating it to the instrument's least count. The voltmeter's total resistance is R_ total = R_g + R_s = 80 + 920 = 1000 . The full-scale deflection voltage is V_ max = I_g R_ total = 0.01 A 1000 = 10 V . Since the least count is 0.2 V , the number of divisions is N = 10 V 0.2 V = 50 50