K A Tsokos Solutions for Chapter: Electricity and Magnetism, Exercise 4: Test yourself

A proton moves past a bar magnet as shown in the diagram. Find the direction of the force it experience.

A proton moves past a bar magnet as shown in the diagram. Find the direction of the force it experiences.

A proton moves past a bar magnet as shown in the diagram. Find the direction of the force it experiences.

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 high-tension electricity wire running along a north-south line carries a current of $3000A$. The magnetic field of the Earth at the position of the wire has a magnitude of $5.00\times {10}^{-5}T$ and makes an angle of $30°$below the horizontal. Calculate the force experienced by a length of $30.0m$ of the wire.

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.