Which one of the following is true about potentiometer?
(a) Its sensitivity is low
(b) It measures the emf of a cell very accurately
(c) It is based on deflection method
(d) None of the above
Answers
Answer:
Option no. (d)
Explanation:
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" Option D) None of the above ".
Explanation:
Principle of Potentiometer is that the potential dropped across a portion of a wire of uniform cross section carrying a current is directly proportional to the length
The potentiometer is a simple device used to measure the electrical potential.
Option C) It is based on deflection method
Potentiometer is a device that measures emf of particular cell and compare emfs of different cells.it is depends on deflection method. here, zero deflection no current is drawn from the circuit, it is an ideal instrument of infinite resistance that measures potential difference.
Option B) It measures the emf of a cell very accurately
A voltmeter draws current from a circuit, therefore voltmeter measure terminal potential difference rather than emf, while a potentiometer at balance, does not draw any current from the circuit. Hence, its reads the actual value of emf.
Option A) Its sensitivity is low
The sensitivity of a potentiometer is inversely proportional to its potential gradient.