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A constant voltage dc source is connecte...

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 V

B

250 V

C

125 V

D

333 V

Text Solution

Verified by Experts

The correct Answer is:
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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