20 Magnetism and Electromagnetism

Front

Which of the following materials is magnetic? Options: A paper, B rubber, C plastic, D nickel

Back

nickel

Front

Which of the following statements best describes a magnetically soft material? Options: It is easy to bend., It can be magnetised temporarily., It has a very strong magnetic field., It is not attracted to a magnet.

Back

It can be magnetised temporarily.

Front

Where is the strongest part of a magnet?

Back

The ends of the magnet.

Front

Which of the following statements best describes the magnetic field around a bar magnet? Options: A The field is perfectly circular around the bar magnet., B The field lines run from north to south., C The field is uniform all around the magnet., D The field is strongest in the middle of the magnet.

Back

The field lines run from north to south.

Front

In which situation would you expect repulsion to occur?

Back

Two north poles brought together

Front

Which of the following statements represents the best description of field lines? Options: A They show the shape of a magnetic field., B They show the direction of the magnetic force., C They show the strength of the magnetic field., D All of the above statements.

Back

All of the above statements.

Front

How is a uniform magnetic field represented?

Back

Equally spaced straight lines between opposite poles of two magnets

Front

When a current flows through a wire, a magnetic field is established. Which of the following best describes this magnetic field? Options: A It is a circular magnetic field., B It is a weak magnetic field., C The direction can be seen using the right-hand grip rule., D All of the above.

Back

All of the above.

Front

How can the magnetic field surrounding a current carrying wire be strengthened? Options: A by increasing the current through the wire, B by increasing the number of turns, C by wrapping the wire around a soft iron core, D all of the above

Back

All of the above

Front

What aspect of an electromagnet makes it good for use in scrapyards to lift metal from large piles of scrap?

Back

It can be turned on and off.