How does magnetic force cause a loop to contract

[doublea500]

Homework Statement

1. There is a counterclockwise current I in a circular loop of wire situated in an external magnetic field directed out of the page as shown above. The effect of the forces that act on this current is to make the loop
(A) expand in size (B) contract in size (C) rotate about an axis perpendicular to the page
(D) rotate about an axis in the plane of the page (E) accelerate into the page

Homework Equations

none really, there is but this is more of a visual question.

The Attempt at a Solution

i did not know.

answer is b, contract in size

How does the magnetic force cause contracting, just doesn't make sense to me

 

[Zacku]

Hi,

What is your problem exactly? Why would it be impossible in first place?