Magnets and Magnetic Materials

Which of the following materials is magnetic?

• paper

• rubber

• plastic

• nickel

Which of the following statements best describes a magnetically soft material.

• It is easy to bend.

• It can be magnetised temporarily.

• It has a very strong magnetic field.

• It is not attracted to a magnet.

Where is the strongest part of a magnet?

• the middle of the magnet

• the ends of the magnet

• the field is the same strength all around the magnet

• the field is strongest inside the magnet

Which of the following statements best describes the magnetic field around a bar magnet?

• The field is circular around the bar magnet.

• The field lines run from north to south.

• The field is uniform all around the magnet

• The field is strongest in the middle of the magnet.

In which situation would you expect repulsion to occur?

• north and south poles brought together

• magnet brought near steel nails

• magnet brought near paper

• two north poles brought together

Which of the following statements represents the best description of field lines?

• They show the shape of a magnetic field.

• They show the direction of the magnetic force.

• They show the strength of the magnetic field.

• All of the above statements.

How is a uniform magnetic field represented?

• with equally spaced straight lines between opposite poles

• with curved lines

• with lines of varying space between two magnets

• with equally spaced lines between opposite poles of two magnets

When a current flows through a wire, a magnetic field is established. Which of the following best describes this magnetic field?

• It is a circular magnetic field.

• It is a weak magnetic field.

• The direction can be seen using the right-hand grip rule.

• All of the above.

How can the magnetic field surrounding a current carrying wire be strengthened?

• by increasing the current through the wire

• by increasing the number of turns

• by wrapping the wire around a soft iron core

• all of the above

An electromagnet can be used in scrapyards to lift metal from the large piles of scrap. What aspect of an electromagnet makes it good at this job?

• It can be made large.

• It can be turned on and off.

• It will only pick up metal.

• It is easy to move.