# Stucking in a Magnetism problem

Here is the problem taken from Pathfinder Physics Book
Here is my attempt

I have calculated magnetic field at that ring, now how to proceed?
Should I use the concept generating electric field due to changing of magnetic field.

Note by Talulah Riley
7 months, 1 week ago

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@Steven Chase @Karan Chatrath

- 7 months, 1 week ago

WTF, why I am not able to mention names? This bug should be fixed.

- 7 months, 1 week ago

Yes, I think you need to apply the concept of an induced electric field. It is the resulting electric field that will cause the ring to rotate.

- 7 months, 1 week ago

@Karan Chatrath ....

- 7 months, 1 week ago

@Karan Chatrath sir the magnetic field is getting constant after $dt$ time?
I don't think it will help?
What do you think , this is the main concept $\vec{E}=-\frac{R}{2}\frac{d\vec{B}}{dt}$
The magnetic field which I have obtained above is $B=\mu_{0} \sigma R \omega$
And it is constant

- 7 months, 1 week ago

Okay, I will try to work it out by myself in some time. Let me give this a thought.

- 7 months, 1 week ago

@Karan Chatrath I have a special problem in this types of problems.
Jaise maine is type ke question ka solution dekh lia maan lo kahi se (but iska solution internet pe available nhi hai) , to mujhe ye samajh aa jaayega, but jab mai khud se solve karne jaauga to nhi hoga.

- 7 months, 1 week ago

Startt by calculating all forces on the particle and applying Newton's second law

- 7 months, 1 week ago

@Karan Chatrath ha ha ha nhi ho rha sir, difficulty aa rhi?
The problem is that magnetics field se particle rotate karega, phir vaha pe drag lagega, bahut confusion ho rha,
Bas start kaise karu ye bata dijiye please

- 7 months, 1 week ago

Newton's second law:

$m \vec{a} = q(\vec{v} \times \vec{B}) -k \vec{v}$

You will get two equations for accelerations along X and Y. Solve those differential equations. The equations will be linear so you can solve for an exact solution.

- 7 months, 1 week ago

@Karan Chatrath $\Huge Thank$ $\Huge You$ $\Huge SO$ $\Huge MUCH$

- 7 months, 1 week ago