In the circuit diagram shown below, the galvanometer 
shows a null deflection, If the primary voltage source is 12 V , the known resistance is 
, and the secondary voltage source is 4 V , what is the value of the unknown resistor 
?
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
Since no current flows through the galvanometer, the voltage across the unknown resistor R is 4 V.
The current (I) flowing through the 
resistor
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