Question

Why the current-carrying straight wire which is kept in a uniform magnetic field, perpendicularly to the direction of the field bends aside? Explain this process with a diagram showing the direction of forces acting on the wire.

Answer 1

Uniform magnetic field (due to horse shoe magnet)

Magnetic field due to current carrying straight wire

Net field formed due to the above two fields 

Explanation : 

The net field in upper part is strong and in lower part it is weak. Hence a nonuniform field is created around wire. Therefore the wire tries to move to the weaker field region.