# Force on charged particle to enter electric field perpendicularly!

1. Jul 10, 2008

### vishnukorde

how much force, if at all. is required to make a particle enter an electric field perpendicularly...
eg, to let a charged particle enter a charged capacitor perpendicularly, is external force required??

2. Jul 10, 2008

### DeepSeeded

I don't think a charged particle CAN enter a field perpendicularly. If it is always perpendicular to the field then it would orbit the field.

If it was already in the field within the capacitor then it shouldnt take any force to move it, at a constant velocity, perpendicular to the field.

3. Jul 10, 2008

### vishnukorde

what does this mean,"if it is always perpendicular to the field then it would orbit the field."...why???

4. Jul 10, 2008

### DeepSeeded

If your perpendicular to the field exiting the charged object then you are going around it considering it is a point object which all electric objects are from an outside the field point of view.

5. Jul 10, 2008

### Crosson

In a real capacitor, edge effects cannot be ignored and so a reasonably large force would be required to enter the region perpendicularly, since the charged particle would be attracted to the appropriate plate.