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AP EAMCET202021 Sep 2020Morning ShiftPhysicsCurrent ElectricityActual

The wire of potentiometer has resistance (4 ) and length (1 ~m ). It is connected to a cell of emf (2 ~V ) and internal resistance (1 ). The current flowing through the potentiometer wire is

Options

  1. A(0.1 ~A )
  2. B(0.2 ~A )
  3. C(0.4 ~A )
  4. D(0.8 ~A )

Correct answer

C. (0.4 ~A )

Step-by-step solution

Resistance of potentiometer wire, (R=4 ) Emf of cell, (E=2 ~V ) Internal resistance, (r=1 ) Current flowing through the potentiometer wire, (I= E R+r = 2 4+1 = 2 5 =0.4 ~A )

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