VIVA QUESTIONS:
[1] Define: (i) Internal resistance of cell, (ii) emf of cell.
[2] What should be the internal resistance of an ideal cell?
[3] Is the internal resistance a defect of cell? Explain.
[4] On what factors does the value of internal resistance of a cell depend upon?
[5] What will happen if the emf of driver cell is less than the emf of dry cell whose internal
resistance is to be determined?
[6] Why does the balancing length for unknown emf decrease when 'R' is introduced in the circuit?
[7] What is the use of rheostat in the circuit?
18] Does the resistivity of material of wire of potentiometer affect the internal resistance of cell?
19] How can you make a potentiometer of a given length of wire, more sensitive by using a
resistance box?
[10] Explain sensitivity of potentiometer.
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(i) Internal resistance of cell, (ii) emf of cell
What should be the internal resistance of an ideal cell?
What is the use of rheostat in the circuit?
Explain sensitivity of potentiometer.
Explanation:
1. The resistance present within the battery which obstructs the flow of current.
2.The battery provided by the cell per coulumbs of charge.
Rheostat is the variable resistance(external) in the circuit.
Sensitivity is the smallest potential difference that can be measured by using potentiometer.
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