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In the circuit shown, keys K1 and K2 bot...

In the circuit shown, keys `K_1` and `K_2` both are closed the ammeter reads `I_0`. But when `K_1`is open and `K_2` is closed, the ammeter reads `I_0//2`. Assuming that ammeter resistance is much less than `R_2`, the values of `r` and `R_1` is Omega are

A

`25Omega.50Omega`

B

`25Omega,100Omega`

C

`0,100Omega`

D

`0.50Omega`

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The correct Answer is:
A
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