The galvanometer deflection , when key K1 is closed but K2 is open, equals (see figure). On closing K2 also and adjusting R2 to 5 , the deflection in galvanometer becomes . The resistance of the galvanometer is then , given by [ Neglect the internal resistance of battery ] :
5
12
25
22
Equivalent resistance -
- wherein
Galvanometer resistance
Shunt resistance
Case 1
Case 2
5
Option 2)12
Option 3)25
Option 4)22
Study 40% syllabus and score up to 100% marks in JEE