Question

A particular resistance wire has a resistance of 3 ohm per metre. Find
a) the total resistance of three lengths of this wire each 1.5 m long, joined in parallel.
b) the potential difference of the battery which gives a current of 2 A in each of the 1.5 m length when connected in parallel to the battery.
c) the resistance of 5m length of a wire of the same material, but with twice the area of cross section.

Answer 1

Sensitivity of potentiometer can be increased by. Sensitivity of potentiometer can be increased by increasing the length of the potentiometer wire and by reducing the current in the circuit by using a rheostat. Both the methods help in decreasing the potential gradient, and thereby increasing the resistivity.