Question

24) The e.m.f. of a battery is 10 V. A voltmeter connected across its plates reads 9.8 V. The battery
delivers a current of 0.4 A when connected to a resistance of 24 ohm .Find the resistance of
voltmeter.​

Answer 1

Answer:

Correct option is

C

10V

⇒I×99=9.9

I=0.1A

⇒E−Ir=9.9

E−0.1r=9.9 -------------- 1

E=5(1+r) ------------------ 2

Using 1 & 2

0.1r+9.9=5+5r

4.9

4.9

=r=1Ω

⇒E=0.1+9.9

E=10V