Current Electricity Three Marks Questions

12th Standard EM

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Physics

Time : 00:45:00 Hrs
Total Marks : 30
    10 x 3 = 30
  1. If an electric field of magnitude 570 N C-1, is applied in the copper wire, find the acceleration experienced by the electron.

  2. A copper wire of cross-sectional area 0.5 mm2 carries a current of 0.2 A. If the free electron density of copper is 8.4 × 1028 m-3 then compute the drift velocity of free electrons.

  3. A potential difference across 24 Ω resistor is 12 V. What is the current through the resistor?

  4. Describe the microscopic model of current and obtain general form of Ohm’s law.

  5. Explain the equivalent resistance of a series and parallel resistor network

  6. Explain the determination of the internal resistance of a cell using voltmeter.

  7. In a circuit containing internal resistance r. Find the power delivered

  8. Find the expression for the equivalent emf & internal resistance of the series combination of cells

  9. State Joule's law

  10. Explain Peltier effect.

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