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  5. Current Electricity, Charging & Discharging Of Capacitors / वर्तमान बिजली, चार्ज और कैपेसिटर का निर

NEET Physics Current Electricity, Charging & Discharging Of Capacitors / वर्तमान बिजली, चार्ज और कैपेसिटर का निर NEET PYQ-Current Electricity Charging Capacitors

  • question_answer
    In the circuit shown, the current through the \[4\,\,\Omega \]resistor is 1 A when the points P and M are connected to a DC voltage source. The potential difference between the points M and N is                                     [AIPMPT (S) 2008]

    A)  1.5 V   

    B)       1.0 V

    C)  0.5 V               

    D)       3.2 V

    Correct Answer: D

    Solution :

    [d] Key Idea: In parallel resistances, potential difference across them is same.
    Potential difference across PM
    \[V=4\times 1=4\] volt (i.e., across \[4\,\,\Omega \])
    Equivalent resistance of lower side arm,
                \[{{R}_{eq}}=1+\frac{0.5\times 0.5}{0.5+0.5}=1.25\Omega \]
    Now the circuit can be shown as
    Let current I flows in lower branch, so
    \[1.25I=4\,V\]
    or         \[I=\frac{4}{1.25}=3.2A\]
                Therefore, 3.2 A current flows in \[1\,\,\Omega \] resistance, hence potential difference between M and N is \[V'=3.2\times 1=3.2\] volt


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