A bar magnet is placed in a uniform magnetic field as shown in the diagram.

Suggest whether there is a net force on the bar magnet.

A bar magnet is placed in a uniform magnetic field as shown in the diagram.

Determine how it will move.

A uniform magnetic field is established in the plane of the paper as shown in the diagram, Two wires carry parallel currents of equal magnitudes normally to the plane of the paper at P and Q. Point R is on the line joining P to Q and closer to Q. The magnetic field at position R is zero. 

Determine whether the currents are going into the paper or out of the paper.

A uniform magnetic field is established in the plane of the paper as shown in the diagram, Two wires carry parallel currents of equal magnitudes normally to the plane of the paper at P and Q. Point R is on the line joining P to Q and closer to Q. The magnetic field at position R is zero.

The magnitude of the current is increased slightly. Determine whether point where the magnetic field is zero moves to the right or to the left of R.

Two charges are fixed as shown. The charges are $2q$ and $-q$. In which regions can the electric field strength due to the two particles be zero?

The diagrams show equal lengths of wires made of the same material and various cross-sectional radii. The drift speed of electrons is indicated. In which wire is the current the greatest? 

Two charged particles $\mathrm{X}$ and $\mathrm{Y}$ are projected horizontally with the same speed from the same point in a region of uniform electric field. Gravity is not negligible.

The two particles follow identical paths. What conclusion about $\mathrm{X}$ and $\mathrm{Y}$ can one draw from this?