# Homework Help: Force exerted by a current carrying wire

1. Mar 4, 2013

### Roodles01

1. The problem statement, all variables and given/known data
A long thing wire carries a current of 2.0A.
An electron of charge -1.6x10^-19 moves parallel to the wire at a distance, d of 0.01m
The electron velocity is 100km/s.

State the magnitude & direction of the force acting on the electron.

2. Relevant equations
q1 q2 / 4∏εr2 rhat

Certainly Right hand rule.

3. The attempt at a solution

Last edited: Mar 4, 2013
2. Mar 4, 2013

### Staff: Mentor

The wire is not charged, Coulomb's law is not relevant.

Hint: The force comes from the magnetic field.

3. Mar 4, 2013

### Roodles01

Well direction magnetic field of wire is found by the"right hand rule";
grab wire with thumb pointing in direction of current & mag field goes in direction of curl of fingers around the wire.
Then force is mutually perpendicular to v & B as I understand.

Good start I think. Yes?

I will try to put more down as I have time.

4. Mar 4, 2013

### Roodles01

Ah! Amperes law I think to find strength of magnetic field. Yes or no.

5. Mar 4, 2013

### Staff: Mentor

That is the correct approach, right.