The resistances of the four arms 
and 
in a Wheatstone’s bridge are 10 ohm, 30 ohm, 30 ohm and 90 ohm, respectively. The e.m.f. and internal resistance of the cell are 7 volt and 5 ohm respectively. If the galvanometer resistance is 50 ohm, the current drawn from the cell will be
Text Solution
Verified by ExpertsD
The situation is as shown in the figure. For a balanced Wheatstone’s bridge
It is a balanced Wheatstone’s bridge. Hence no current flows in the galvanometer arm. Hence, resistance 
becomes ineffective.
The equivalent resistance of the circuit is 
Current drawn from the cell is
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