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NEET Sample Paper NEET Sample Test Paper-76

  • question_answer
    A 10 m long wire of resistance \[20\,\Omega \] is connected in series with a battery of emf 3 V (negligible internal resistance) and a resistance of \[10\,\Omega \]., then the potential gradient along the wire is

    A)  0.1                              

    B)  0.2

    C)  0.4                              

    D)  None of these

    Correct Answer: B

    Solution :

    \[Current\,\,i\,\,=\,\,\frac{V}{R}=\frac{3}{10+20}\,=\,\,0.1\,\,A\] \[\therefore \] Potential difference across \[20 \Omega  = 0.1 \times  20 = 2 V\] Potential gradient \[=\,\,\,\frac{Potential\text{ }difference\text{ }across\,\,20\,\,\Omega }{length\text{ }of\text{ }20\,\Omega \text{ }wire}\,~~~~~~~~~~~\text{ }200\mathbf{2}.~~~~~~~~~~~length\text{ }of\text{ }20Q\text{ }wire\mathbf{1}.~~~~~~~~~~~Potential\text{ }difference\text{ }a\] \[=\,\,\,\,\frac{2}{10}=0.2\,V-{{m}^{-1}}\]


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