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Potentiometer

Why are alloy...

Question

Why are alloys used in meter bridge or potentiometer wire?

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Solution

Dear Student
Generally alloys like constantan or manganin are used as potentiometer wire because they posses high specific resistance and low temperature coefficient.

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Similar questions

Q. Answer the following :
(a) Why are the connections between the resistors in a meter bridge made of thick copper strips?
(b) Why is it generally preferred to obtain the balance point in the middle of the meter bridge wire?
(c) Which material is used for the meter bridge wire and why?
OR
A resistance of R

Ω

draws current from a potentiometer as shown in the figure. The potentiometer has a total resistance

R_{0} Ω

. A voltage V is supplied to the potentiometer. Derive an expression for the voltage across R when the sliding contact is in the middle of the potentiometer.

Q. Answer the following :

(a) Why are the connections between the resistors in a meter bridge made of thick copper strips?

(b) Why is it generally preferred to obtain the balance point in the middle of the meter bridge wire?

(c) Which material is used for the meter bridge wire and why?

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(b) Why is it generally preferred to obtain the balance point in the middle of the meter bride wire?
(c) Which material is used for the meter bridge wire and why?

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