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  • Give answer! - Current Electricity - NEET-3

If power dissipated in the 9-\Omega resistor in the circuit shown is 36 watt, the potential difference across the 2-\Omega resistor is

  • Option 1)

    4 volt

  • Option 2)

    8 volt

  • Option 3)

    10 volt

  • Option 4)

    2 volt

 

Answers (1)

best_answer

As learnt in

Power dissipiated in external resistance -

P=(frac{E}{R+r})^{2}R

-

 

 

Power dissipated in 9 \Omega=36 \:watt

\therefore P =I^{2}R\:\:\Rightarrow I=\sqrt{\frac{P}{R}}=2a

Current through 6 \Omega=2 \times \frac{9}{6}=3A

\therefore Current through 2 \Omega=5A

Potential difference=10\:V


Option 1)

4 volt

This option is incorrect.
 

Option 2)

8 volt

This option is incorrect.
 

Option 3)

10 volt

This option is correct.
 

Option 4)

2 volt

This option is incorrect.
 

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Plabita

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