In the circuit shown, when key K 1 is closed, then the ammeter reads I 0 whether K 2 is open or closed. But when K 1 is open the ammeter reads 
, when K 2 is closed.
Assuming that, ammeter resistance is much less than R 2 , the values of r and R 1 (in ohms) are
Text Solution
Verified by ExpertsThe correct answer is:
D
When K 1 is closed, R 1 is short-circuited.
When K 2 is open, 
… (i)
When K 2 is closed, 
… (ii)
From these two equations, we get 
When K 1 is open and K 2 is closed,
… (iii)
From Eqs. (i) and (iii), we have
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