Iron filings sprinkled near a magnet arrange themselves into a pattern that illustrates the

The correct answer is "Magnetic field lines".

Explanation:

Magnetic field is the surrounding around the magnet in which the magnetic force can be influenced.

The magnetic field lines originate from the north pole and end at the south pole. The magnetic field lines never intersect each other otherwise there will be two directions of the magnetic field at the same point which is not possible.

Iron fillings are attracted towards the magnet.

In the given problem, Iron filings sprinkled near a magnet arrange themselves into a pattern that illustrates the magnetic field lines.

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