Electromagnetic Induction and Faraday's Law w/ Right Hand Rule

[lorx99]

Homework Statement

Homework Equations

Right Hand Rule

The Attempt at a Solution

I am not understanding why the force is left. I can only figure out that the current in the solenoid is moving clockwise because of the right hand rule. From there, I see that the induced current might be counterclockwise , but i am not sure why the positive point charge moves left.

 

[gneill]

Contemplate Faraday's Law.

 

[lorx99]

Contemplate Faraday's Law.

Is it moving left because the induced current is clockwise and so the electric force is left at tbat point or some other reason?

 

[gneill]

What precisely does Faraday's Law state?

 

[lorx99]

What precisely does Faraday's Law state?

The emf produced is equal to the negative rate of change in flux

 

[gneill]

Right. An emf (electric field) is produced. That's what would drive a current in a loop surrounding the changing magnetic field. The emf exists in space regardless of whether or not an actual wire occupies the space.

So imagine that there's loop passing through where the charge is. If the charge was in that loop, which direction would it be 'motivated' to go?

 

[lorx99]

Right. An emf (electric field) is produced. That's what would drive a current in a loop surrounding the changing magnetic field. The emf exists in space regardless of whether or not an actual wire occupies the space.

So imagine that there's loop passing through where the charge is. If the charge was in that loop, which direction would it be 'motivated' to go?

View attachment 233728

Oh i think i understand. Does this involve len's law to figure out the direction of the induced current?

Once we know the direction of induced current, the electric force (electric field caused by changing magnetic field which causes the induced current is along the direction of the charge particle which is leftwards since the current is moving left at the top if the induce current is counterclockwise.

 

[gneill]

All correct!