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In the circuit shown, the reading of the...

In the circuit shown, the reading of the Ammter is doulbed after the switch is closed. Each resistor has a resistance `= 1 Omega` and the ideal cell has an e.m.f. `= 10 V`. Then the ammeter has a resistance equal to

A

`2 Omega`

B

`1 Omega`

C

`2.5 Omega`

D

None

Text Solution

Verified by Experts

The correct Answer is:
A
(a) `I_(1) = (10)/(2 + R_(A)), I_(2) = (10)/(R_(A)` and `I_(2) = 2 I_(1)`
solving we get `R_(A) = 2 Omega`
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