Question

16) Two potentiometers A and B are made of identical material of wire of same area of cross section but length of A is 10m and B is 5m. Rest of the circuit to measure emf is same. Why do
you prefer potentiometer A to measure emf more accurately than B? ------[1]​

please give me the answer fastly

Answer 1

Answer:

Since length of wire A is more so it is more accurate than wire B

Explanation:

As we know that the precise potentiometer device is defined by its sensitivity

Now we know that sensitivity of the device is inversely depends on the potential gradient of the device

Here we know that potential gradient is the ratio of Total potential drop across the wire per unit of its length

Here we can say

Potential gradient = $\frac{V_o}{L}$

now we can say that more is the length of the wire smaller will be its potential gradient and hence it will be more sensitive device

So here since length of wire A is 10 m while wire B length is 5 m

so Potentiometer A is more accurate than Potentiometer B

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Topic : Potentiometer

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