Electricity and Magnetism
# Magnetic Fields

**P** and **Q**, which of the following are the appropriate directions of the compasses at points **P** and **Q**, respectively?

Neglect the Earth's magnetic field.

**Assumptions and Details**

- Red represents the north pole, blue the south.

Two current-carrying-wires are both pointing straight up and down, and are separated by some distance. If the directions of the two currents are parallel, what would the resulting magnetic field look like?

The symbol $\odot$ means the direction of the current is pointed out of the plane in the figure.

**P** and **Q** in the above diagram, which of the following are the appropriate respective directions of the two compasses?

Neglect the Earth's magnetic field.