Force between two charged particle beams -- proton and electron beams

[carlyn medona]

Homework Statement

A proton beam is going from north to south and an electron beam is going from south to north, so in which direction is the electron beam deflected

Homework Equations

The Attempt at a Solution

. [/B]
I thought an electron beam from south to north, would be equivalent to proton beam from north to south, and my textbook stated that force between two parallel proton beams is repulsive, so won't it be repulsive in this case too?

 

[berkeman]

Homework Statement

A proton beam is going from north to south and an electron beam is going from south to north, so in which direction is the electron beam deflected

Homework Equations

The Attempt at a Solution

. [/B]
I thought an electron beam from south to north, would be equivalent to proton beam from north to south, and my textbook stated that force between two parallel proton beams is repulsive, so won't it be repulsive in this case too?

You did not list the Relevant Equations. Are you familiar with the vector form of the Lorentz Force equation? Try using that...

 

[carlyn medona]

Okay in that case I got an attractive force, I can't assume electron beam in one direction equivalent to a proton beam in opposite direction?

 

[berkeman]

Okay in that case I got an attractive force, I can't assume electron beam in one direction equivalent to a proton beam in opposite direction?

Please write out the full vector Lorentz Force equation. The sense of the charge affects several things in the full equation...