During an experiment with a meter bridge, the galvanometer shows a null point when the joceky is pressed at 40.0 cm using a standard resistance of 90 Ω Ω , as shown in the figure. The least count of the scale used in the meter bridge is 1 mm. The unknown resistance is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
The unknown resistance is given by, 
Putting 
For error analysis, 
In multiplication and division, fractional errors get added up.
Therefore, 
Hence, 
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