In the circuit shown, the reading of the ammeter is doubled after the switch is closed. Each resistor has a resistance equal to 1 Ω and the ideal cell has an emf equal to 10 V. Then the ammeter has a resistance equal to
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a
2 Ω
b
1 Ω
c
2.5 Ω
d
none of these
answer is A.
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Detailed Solution
I1=102+RA, I2=10RA and I2=2I1Solving, we get RA=2 Ω
In the circuit shown, the reading of the ammeter is doubled after the switch is closed. Each resistor has a resistance equal to 1 Ω and the ideal cell has an emf equal to 10 V. Then the ammeter has a resistance equal to