2. Sample Papers
  3. NEET

NEET Sample Paper NEET Sample Test Paper-18

  • question_answer
    The diode used in the circuit shown in the figure has a constant voltage drop of 0.5 V at all currents and a maximum power rating of 100 milliwatts. What should be the value of the resistor R, connected in series with the diode, for obtaining maximum current?

    A) \[1.5\,\Omega \]                      

    B) \[5\,\Omega \]

    C) \[6.67\,\Omega \]                    

    D) \[200\Omega \]

    Correct Answer: B

    Solution :

    Power = P = Vi \[\therefore \]\[\frac{100}{1000}=0.5i\Rightarrow i=\frac{1}{5}A\] Invoking kirchoff?s voltage law in the given circuit, we get \[iR+0.5-1.5=0\] or,\[\frac{R}{5}-1=0\Rightarrow R=5\Omega \] Hence, the correction option is [b].


You need to login to perform this action.
You will be redirected in 3 sec spinner