Two parallel wires P and Q lie in the plane of the page in a uniform magnetic field directed into the page. P carries conventional current upwards and Q carries conventional current downwards. The field due to either wire at the other is negligible. Which gives the forces due to the uniform field?
P to the right; Q to the right
P to the right; Q to the left
P to the left; Q to the right
P to the left; Q to the left