CUET Preparation Today
CUET
Physics
Current Electricity
Figure shows a potentiometer circuit for determining the internal resistance of a cell. When switch S is open, the balance point is found to be at 76.3 cm of the wire. When switch S is closed and the value of R is 4.0 Ω, the balance point shifts to 60.0 cm. The internal resistance of cell E' is. |
1Ω 1.1Ω 2.1Ω 5.1Ω |
1.1Ω |
r=l−l′l′R=76.3−60604Ω=1.1Ω |