The galvanometer deflection, when key 
is closed but 
is open, equals 
(see figure). On closing 
also and adjusting 
to 
, the deflection in galvanometer becomes 
The resistance of the galvanometer is, then, given by [Neglect the internal resistance of battery]:
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
JEE Main 2019
When key 
is closed and key 
is open
When both the keys are closed
Dividing 
by 
, we get
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