Find x if P is a null point ?

Find the value of x if P is a null point

Find the value of x if A is the null point?

What are null points ?

At the null point____

If the resistance X and Y (XltY) be placed in the two gaps of a metre bridge , null point is obtained at a length of 20cm . Keeping Y unchanged if a resistance 4X is placed in place of X what will be the position of the null point ?

A potentiometer , with a wire of length 10 m, is connected to an accululator of steady voltage. A lenchlanche cell gives a null point at 7.5 m If the length of the potentiometer wire is increaseed by 1 m, find the new posistion of the null point.

The figure shows experimental set up of a meter bridge. When the two unknown resistances X and Y are inserted, the null point D is obtained 40 cm from the end A. When a resistance of 10 Omega is connected in series with X, the null point shifts by 10 cm. Find the position of the null point when the 10 Omega resistance is instead connected in series with resistance 'Y'. Determine the value of the resistance X and Y

The figure shows experimental set up of a meter bridge. When the two unknown resistances X and Y are inserted, the null point D is obtained 40 cm from the end A. When a resistance of 10 Omega is connected in series with X, the null point shifts by 10 cm. Find the position of the null point when the 10 Omega resistance is instead connected in series with resistance 'Y'. Determine the value of the resistance X and Y

With an unknown resistance X in the left gap and a resistance of 30 Omega in the right gap of meter bridge . The null point is obtained at 40 cm from the left end of the wire . Find i) the unknown resistance and ii)the shift in the position of the null point , when the resistances in both the gaps are increased by 15 Omega .