Question

McQ
(1)
If the length of a potentiometer wire is increased by keeping
constant potential difference across the wire, then​

Answer 1

Answer:

C

Explanation:

Answer 2

If the length of a potentiometer wire is increased by keeping  constant potential difference across the wire, then  the null point is obtained at larger distance

Explanation:

The question is,

If the length of a potentiometer wire is increased by keeping  constant potential difference across the wire, then

(a) null point is obtained at larger distance

(b) there is no change in the null point

(C) potential gradient is increased

(d) null point is obtained at shorter distance​

If the length of a potentiometer wire is increased by keeping  constant potential difference across the wire, then

• There is a formation of disturbance in the null point.
• Also it will at larger distance when compared to previous distance
• Potential gradient is equal to the ratio between Potential difference and Length of the wire

                 $\text {Potential gradient} = \frac{Potential\ difference}{Length\ of\ the\ wire}$

                              $\text {Potential gradient} = \frac{V}{L}$

• From the above relation, it is clear that, Potential difference and potential gradient are directly proportional and Potential gradient and Length of the wire are inversely proportional.
• So the potential gradient decreases when the length of the wire increases.

Therefore the null point  will be at longer distance when the length of a potentiometer wire is increased by keeping  constant potential difference across the wire

To Learn More ...

1) The potential gradient between the two charged plates having separation, of 0.5 cm and potential difference of 12 volts is :-

https://brainly.in/question/5510499

2) Why the potential gradient decreases with increase in resistance?

https://brainly.in/question/3970633