Determine the magnitude and direction of magnetic field at p

Question

Problem

One long, straight wires that carries a current of 18 A in the downward direction.

1. Determine the magnitude and direction of magnetic field at P.

2. If an electron is moving with velocity 5x10³ m/s directly into the paper, determine the magnitude and direction of the magnetic force on the electron at the instance.

3. If an electron is moving with the same velocity up, determine the magnitude and direction of the magnetic force on the electron at the instance.