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Question

# An ideal ammeter (zero resistance) and an ideal voltmeter (infinite resistance) are connected as shown in fig. The ammeter and the voltmeter readings are

A
6.25 A, 3.75 V
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B
0.00 A, 20 V
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C
3.00 A, 3.75 V
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D
6.00 A, 6.25 V
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Solution

## The correct option is A 0.00 A, 20 VFrom given figure the equivalent resistance R of the combination isR=(5×155+15+1.25)R=7520+1.25R=3.75+1.25∴R=5ΩHence the current I through the circuit isI=205A=4ANow, current through 5Ω resistance is 1520×4=3AAlso reading of voltmeter Vr(say) is equal to the potential drop across 1.25Ω resistanceVr=4×1.25V=5V

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