How does magnetic force cause a loop to contract

AI Thread Summary
A circular loop of wire carrying a counterclockwise current in an external magnetic field directed out of the page experiences a magnetic force that causes it to contract in size. The correct answer to the posed question is that the loop contracts due to the interaction between the magnetic field and the current. This phenomenon can be explained by the Lorentz force, which acts on the charged particles in the wire, resulting in a net inward force. The discussion highlights confusion regarding the mechanics behind this contraction, emphasizing the need for a clearer understanding of magnetic forces. Overall, the magnetic force's effect on the loop is to induce contraction rather than expansion or rotation.
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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
 
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Hi,

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

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