How does magnetic force cause a loop to contract

In summary, the conversation discusses a circular loop of wire with a counterclockwise current in an external magnetic field. The forces acting on the current cause the loop to contract in size. The conversation also mentions a question about the magnetic force and the concept of contraction.
  • #1
doublea500
20
0

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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  • #2
Hi,

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

1. How does magnetic force cause a loop to contract?

The magnetic force acts on the electrons in the loop, causing them to move in a circular motion. This creates a current, which in turn creates a magnetic field that interacts with the original magnetic field and causes the loop to contract.

2. Does the strength of the magnetic field affect the contraction of the loop?

Yes, the strength of the magnetic field plays a crucial role in the contraction of the loop. The stronger the magnetic field, the stronger the force acting on the electrons and the more significant the contraction of the loop.

3. What other factors besides magnetic force can cause a loop to contract?

Aside from magnetic force, other factors that can cause a loop to contract include temperature, pressure, and the material the loop is made of. All of these can affect the movement of the electrons and the resulting magnetic field.

4. Can a loop contract without a magnetic field?

No, a loop cannot contract without a magnetic field. The presence of a magnetic field is necessary to create a current in the loop, which is essential for the contraction to occur.

5. Is the contraction of a loop reversible?

Yes, the contraction of a loop is reversible. When the magnetic field is removed, the current and resulting magnetic field in the loop also disappear, causing the loop to return to its original state.

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