Three resistances 
each of 2 
and an unknown resistance 
form the four arms of a Wheatstone bridge circuit. When a resistance of 6 
is connected in parallel to 
the bridge gets balanced. What is the value of 
.
A
3 
B
6 
C
1 
D
2 
.
.
Text Solution
Verified by ExpertsThe correct answer is:
A
Let 
be the equivalent resistance between S and 
(i)
Therefore, the equivalent circuit diagram drawn below.
For a balanced Wheatstone’s bridge, we get
or 
From eqn. (i), we get
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
A galvanometer having a coil resistance of 60 Ω Ω shows full scale deflection when a current of 1.0…
A student measures the terminal potential difference (V) of a cell (of emf ε and internal resistanc…
See the electrical circuit shown in this figure. Which of the following equations is a correct equa…
A thermocouple of negligible resistance produces an e.m.f. of 40 µV/°C in the linear range of tempe…
In the circuit shown in the figure, if potential at point A is taken to be zero the potential at po…
A milli voltmeter of 25 milli volt range is to be converted into an ammeter of 25 ampere range. The…