A potentiometer wire AB having length L and resistance 
is joined to a cell D of 
and internal resistance r. A cell C having 
and internal resistance 3 r is connected. The length AJ at which the galvanometer as shown in fig. shows no deflection is:
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
JEE Main 2019
Let x be the length AJ at which galvanometer shows null deflection current,
or 
or, 
Prepare Smarter with CGP Edu
Get practice questions, solutions, and test series in one place.
Write a Review
Share your experience with this question and solution.
Commentary
Send your comment, doubt, correction, or feedback to admin.
Similar Questions
Explore conceptually related problems
When the switch S, in the circuit shown, is closed then the valued of current i will be:
Drift speed of electrons, when of current flows in a copper wire of cross section , is v. If the …
A carbon resistance has following colour code. What is the value of the resistance?
In the given circuit the internal resistance of the cell is negligible. If and and the reading o…
A uniform metallic wire has a resistance of and isbent into an equilateral triangle. Then, the res…
A carbon resistor is color coded with green, black, red and brown respectively. The maximum curren…