Force on a Current Carrying Conductor

[mit_hacker]

Homework Statement

Which of the following situations would result in a magnetic force on the wire that points due north?

Check all that apply.

Current in the wire flows straight down; the magnetic field points due west.
Current in the wire flows straight up; the magnetic field points due east.
Current in the wire flows due east; the magnetic field points straight down.
Current in the wire flows due west and slightly up; the magnetic field points due east.
Current in the wire flows due west and slightly down; the magnetic field points straight down.

Homework Equations

Right hand rule of left hand rule

The Attempt at a Solution

I know that the third one is correct but it says that the answer is wrong which means there is atleast one other correct answer but I have NO CLUE which one that is. Please help.

 

[kuruman]

A. When the current is up and the magnetic field is East, the force is North.
B. When both current and field in A are reversed, the force is North.
If the current is mostly West and slightly up you have situation A but a weaker force to the North.