IGCSE Physics (0625) Unit 4 Electricity and magnetism -4.1 Simple phenomena of magnetism Paper 1

Question

A soft-iron bar is not magnetised. It is held close to the N pole of a magnet and then to the S pole of the same magnet.

What will be the result?

 

N pole

S pole

A

attracts

attracts

B

attracts

repels

C

repels

attracts

D

repels

repels

Answer/Explanation

Ans: A

Question

Diagram 1 shows a small compass needle with its poles marked. It is not near any magnetic materials.

Diagram 2 shows a bar magnet with its poles marked. The compass needle is placed at point P.

                                             

In which direction will the N pole of the compass needle point?

  1. to the left

  2. to the right

  3. down the page

  4. up the page

Answer/Explanation

Ans: B

Question

Which diagram shows the pattern and direction of the magnetic field lines around a bar magnet?

                 

Answer/Explanation

          Ans: C

Question

The ends of three metal rods are tested by holding end Q of rod 1 close to the others in turn.                                                         

The results are as follows.

End Q attracts end R.

End Q attracts end S.

End Q attracts end T.

End Q repels end U.

Which of the metal rods is a magnet?

  1. rod 1 only

  2. rod 1 and rod 2

  3. rod 1 and rod 3

  4. rod 3 only

Answer/Explanation

Ans: C

Question

Why is soft iron used for the core of an electromagnet?

A Soft iron easily becomes a permanent magnet.

B Soft iron is a good electrical conductor.

C Soft iron is a poor thermal conductor.

D Soft iron loses its magnetism when the current in the coil is switched off.

Answer/Explanation

Ans: D

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