# 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 Lil Doug
2 weeks, 6 days ago

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@Steven Chase @Karan Chatrath

- 2 weeks, 6 days ago

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

- 2 weeks, 6 days 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.

- 2 weeks, 6 days ago

@Karan Chatrath ....

- 2 weeks, 6 days 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

- 2 weeks, 6 days ago

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

- 2 weeks, 5 days 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.

- 2 weeks, 5 days ago

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

- 2 weeks, 5 days 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

- 2 weeks, 5 days 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.

- 2 weeks, 5 days ago

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

- 2 weeks, 5 days ago