There will be no induced voltage in an inductor if: a) the current is sinusoidal, b) the current is constant, c) the average of current is zero, d) the average of the current is negative.

The correct option is b

Explanation:

Generally the induced voltage in an inductor is mathematically represented as  

Now    is the change in voltage with respect to time , when this is zero i.e when the current is not changing(what this means is when current is constant ) the induced voltage becomes    

=>    

Hence if the current is not changing with respect to time there will be no induced voltage

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

a is the best answer your welcome