Question

Resistance increases when:

a) radius decreases
b) length decreases
c) viscosity decreases
d) hematocrit decreases
e) none of these answers

Answer 1

a) Radius decreases

Step-by-step explanation:

Resistance of any conductor is directly proportional to the length of the conductor and inversely proportional to its cross-sectional area.

So, in mathematical terms, the resistance is written as

`R` = ρ
`(L)/(A)`

As we know, cross sectional area is related to the radius of the conductor so if the radius of the conductor is decreased, the cross-sectional area will also decrease.

And if the cross-sectional area will decrease, the resistance will increase.

Thus decreasing the radius, increases the resistance.