Solving a Physics Problem Involving a Square & Magnetic Field

[Frillth]

Homework Statement

I have the following problem for physics homework:

We are supposed to take t=0 as the instant when the corner of the square is just about to leave the magnetic field.

Homework Equations

Unsure.

The Attempt at a Solution

Since the magnetic flux will decrease as the square leaves the field, the induced magnetic field because of the induced EMF in the square will also point downward. This tells us that the current will flow clockwise.

That's all I've got so far, and I don't even know if it's right. What is producing the forces here that would oppose our push on the square?

Edit: OK, I think that before tv=L/sqrt(2), power is 2IBtv^2. After tv = L/sqrt(2), power is 2IBv(sqrt(2)L - tv). Is it true that the current in the wire will change as the square gets pushed? If so, what do I do to figure out what current is in terms of the other variables?

 

[LowlyPion]

How much power is needed to move the loop outside the B-field?

 

[nlightner]

It is great that you are thinking about the problem and trying to come up with a solution. However, there are a few things that need to be clarified before we can provide a complete response.

Firstly, it would be helpful to know what the problem is asking for specifically. Is it asking for the current in the wire, the induced EMF, or the forces acting on the square? This will help us determine which equations and concepts are relevant to the problem.

Secondly, it is important to have a clear understanding of the setup of the problem. Is the square moving through a uniform magnetic field or is the magnetic field changing as the square moves? This will affect the equations that we use to solve the problem.

Lastly, it would be helpful to have a diagram or a clearer description of the problem. This will help us visualize the situation and provide a more accurate response.

In general, when solving physics problems, it is important to clearly define the variables, understand the setup of the problem, and use appropriate equations and concepts to arrive at a solution. It is also helpful to double check your work and make sure it makes sense logically.

Without more information, it is difficult to provide a specific response to this problem. However, as a scientist, I encourage you to continue exploring and experimenting with different approaches to solve the problem. Don't be afraid to ask for help or clarification from your teacher or classmates if needed. Good luck!