Question

Which of the following statements correctly describes the relationship between the resistance of a resistor and its physical volume? Select one: a. Resistance always decreases with increasing volume b. Resistance always increases with increasing volume c. Resistance always remains constant with increasing volume d. Resistance may decrease or increase depending on whether the area or length is increasing respectively A carbon composition variable resistor may become electrically noisy due to: Select one: a. High humidity b. Low humidity c. Mechanical stress d. Improper wiper contact

Answer 1

Answer) Last option is the correct answer i.e, resistance may decrease or increase depending on whether the area or length is increasing respectively.

We know that,

$\ R = p\frac {l}{A}$

So, resistance depends on length and cross sectional area of the wire.