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JEE Main & Advanced Physics Current Electricity, Charging & Discharging Of Capacitors / वर्तमान बिजली, चार्ज और कैपेसिटर का निर Question Bank Kirchhoff's Law, Cells

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    A battery has e.m.f. 4 V and internal resistance r. When this battery is connected to an external resistance of 2 ohms, a current of 1 amp. flows in the circuit.  How much current will flow if the terminals of the battery are connected directly [MP PET 2001]

    A)            1 amp                                     

    B)            2 amp

    C)            4 amp                                     

    D)            Infinite

    Correct Answer: B

    Solution :

               \[i=\frac{E}{R+r}\Rightarrow 1=\frac{4}{2+r}=r=2\Omega \] Short circuit when terminals of battery connected directly then current flows which is \[{{i}_{SC}}=\frac{E}{r}=\frac{4}{2}=2A\].


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