a battery of emf 3 volts and internal resistance r is connected in series with a resistor of 55 ohm - Science -

Question

a battery of emf 3 volts and internal resistance r is connected in
series with a resistor of 55 ohm through an ammeter of resistance 1
ohm the ammeter reads 50 miliampere draw circuit and calculate
value of r

Vipra Mishra · Accepted Answer

Solution
<img src=
"https://d10lpgp6xz60nq%20cloudfront%20net/physics_images/PR_XII_V01_C02_S01_093_S01%20png"
style="height: 148px; width: 250px;">
The circuit diagram is shown in figure
ε = 3VI = 50 mA = 50 ×10-3 ATotal resistance of the circuitR' =55 +1+r = 56 +rAsI =εR'  50 ×10-3 A =3 56 +r 56 +r =3 50 ×10-3  =60r = 4 Ohm

a battery of emf 3 volts and internal resistance r is connected in series with a resistor of 55 ohm through an ammeter of resistance 1 ohm the ammeter reads 50 miliampere draw circuit and calculate value of r.