Back to Current Electricity In order to measure the internal resistance r
1
of a cell of emf E, a meter bridge of wire resistance R
0
= 50\Omega, a resistance R
0
/2, another cell of emf E/2 (internal resistance r) and a galvanometer G are used in a circuit, as shown in the figure. If the null point is found at l = 72 cm, then the value of r
1
= __________ \Omega.
Class 12 • Physics • Chapter-3
Current Electricity
Question 705 of 735
705MediumInteger TypeJEE Advanced2021
In order to measure the internal resistance r
1
of a cell of emf E, a meter bridge of wire resistance R
0
= 50\Omega, a resistance R
0
/2, another cell of emf E/2 (internal resistance r) and a galvanometer G are used in a circuit, as shown in the figure. If the null point is found at l = 72 cm, then the value of r
1
= __________ \Omega.
Integer / Numeric Answer Type
Enter your answer as a number (integer or decimal).