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  • A constant voltage dc source is connected, as shown in Figure, across two resistors of resistances 400 k and 100 k

A constant voltage dc source is connected, as shown in Figure, across two resistors of resistances 400 k\Omega and 100 k\Omega

What is the reading of the voltmeter, also of resistance 100 k \Omega, when connected across the second resistor as shown?

Option: 1

111 V

 


Option: 2

250 V

 


Option: 3

125 V

 


Option: 4

333 V


Answers (1)

best_answer

Effective resistance across voltmeter =50 \mathrm{k} \Omega. Total resistance across the dc supply = 450 \mathrm{k} \Omega

Current drawn from supply \mathrm{\frac{1000 \mathrm{~V}}{450 \mathrm{k} \Omega}=\frac{1}{450} A. ~potential}

Difference across voltmeter = \frac{50 \times 1000}{450} \mathrm{~V}=\frac{1000}{9} \mathrm{~V}=111 \mathrm{~V}

Posted by

Anam Khan

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