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Q.

1 ohm resistance is in series with an Ammeter in a circuit . This part of the circuit is balanced by 75cm of potentiometer wire. A standard cell of 1.02V is observed to be balanced by 50cm. If the Ammeter shows a reading of 1.5A then the error in the Ammeter reading is

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a

0.002A

b

0.03A

c

1.01A

d

no error

answer is B.

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Detailed Solution

Potential difference across 1Ω
7550×1.02=1.53V ∴ i1=1.53(1)=1.53A
Error = i1– ammeter reading
= 1.53–1.5=0.03A

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