Question

What will be the effect on potential gradient of a potentiometer on increasing:
(a) external resistance R
(b) length of wire ?

Answer 1

i think a)external resistanceR

Answer 2

As we know
V=IR
By keeping current I constant potential V is directly proportional to resistance R so
(a)
By increasing external resistance R potential gradient will increase with increase in resistance R
(b)
By increasing length of wire resistance R will increase so potential gradient will also increase.