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A constant voltage dc source is connected, as shown in Fig. A2.7, across two resistors of resistances `400 kOmega` and `100 k Omega`. What is the reading of the voltmeter, also of resistance `100 kOmega`, when connected across the second resistor as shown? A. 111 VB. 250 VC. 125 VD. 333 V |
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Answer» Correct Answer - A a. Effective resistance across voltmeter is `50kOmega`. Total resistance across the dc supply is `450 kOmega`. Current drawn from supply `1000 V//450 kOmega = 1//450A`. Potential difference across voltmeter is `(50 xx 1000)/450 V = (1000)/9 V = 111V` . |
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