If the length of potentimeter wire is incresed ,than the accuracy inthe determnation of null point (A). decreass (B). incress (c).remain unaffected (D). none of these

Hello D hanshri ,

The accuracy of potentiometer can be increased by decreasing the potential gradient, potential gradient can be decreased by increasing the length of potentiometer. Hence the increase in length of potentiometer wire increase s the accuracy .

(B) Increases

Hope this helps!

hi there

As you know, the potential gradient is equal to V/L ie Potential difference divided by length of the wire. So, the potential gradient decreases with increase of length of potentiometer wire. Potential Gradient is the decrease in potential per unit length. It is calculated as V / L, where V is the potential difference between two points and L is the distance between two points. The longer the wire the lesser the potential gradient and the greater the sensitivity of the potentiometer.