The magnetic field at the earth's surface can vary in response to solar activity. during one intense solar storm, the vertical component of the magnetic field changed by 2.8 ? t per minute, causing voltage spikes in large loops of the power grid that knocked out power in parts of canada.

what emf is induced in a square 190km on a side by this rate of change of field?

The induced emf is 1684.67 V.

Explanation:

Given that,

Rate of change of magnetic field = 2.8 μT/m

Distance = 190 km

We need to calculate the area

Using formula of area

Put the value into the formula

We need to calculate the induced emf

Using formula of induced emf

Put the value into the formula

Hence, The induced emf is 1684.67 V.

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