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NEET Sample Paper NEET Sample Test Paper-36

  • question_answer
    The potential difference in open circuit for a cell is 2.2 volts. When a 4 ohm resistor is connected between its two electrodes the potential difference becomes 2 volts. The internal resistance of the cell will be

    A)  1 ohm       

    B)  0.2 ohm

    C)  2.5 ohm     

    D)  0.4 ohm

    Correct Answer: D

    Solution :

     The potential difference in open circuit for the cell is 2.2 volts, it means the emf of the battery should be 2.2 volts. Now a 4 ohm resistor is connected between its two electrodes, then the potential difference across the battery becomes 2 volts \[V=\varepsilon -ir\Rightarrow 2=2.2-ir\] \[\Rightarrow \] \[ir=0.2\,V\] ?(i) But \[i=\frac{e}{r+R}=\frac{2.2}{r+4}\] ?(ii) Putting the value of \[i\] in (i), we get r = 0.4 ohm.


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