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Q.

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
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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