What would decrease the resistance of wires carrying an electric current?

a. shorter wires
b. higher-temperature wires
c. darker-colored wires
d. thinner wires

Shorter wires

Explanation:

The formula used to find the resistance of wires carrying electric current is given by :

...............(1)

Where

is the resistivity of the substance

l is the length of the wire

A is the area of cross section  

From equation (1), it is clear that the resistance of the wire is directly proportional to its length. So, by decreasing the length of the wire, the resistance of the wire decrease. Hence, the correct option is (a).

d₁ = displacement of tern from arctic to antarctic = 11000 miles

d₂ = displacement of tern from antarctic to arctic =   - 11000 miles

d = total displacement for the journey

total displacement for the journey is given as

d = d₁ + d₂

d = 11000 + (-11000)

d = 0 miles

t₁ = time of travel from arctic to antarctic = 3 months = 3 x 30 days = 90 days

t₂ = time of travel from antarctic to arctic = 3 months = 3 x 30 days = 90 days

t = total time of travel

total time of travel is given as

t = t₁ + t₂

t = 90 + 90

t = 180 days

average velocity is given as

average velocity = total displacement/ total time

v = d/t

v = 0/180

v = 0 miles/day