4.1 Simple Magnetism & Magnetic Fields

The magnet is strongest near the

• poles of the magnet

• ends of the magnet

• centre of the magnet

• one-quarter point from the poles of the magnet

When the South Pole of a magnet is placed near an unknown pole of another magnet, the two magnets

• repel each other because the unknown pole is a North Pole

• repel each other because the unknown pole is a South Pole

• attract each other because the unknown pole is a South Pole

• can either attract or repel

When one end of a magnet is placed near a compass, the pointer (N-pole) of the compass turns and points at the magnet because

• the pointer points at any end of a magnet

• the end near the compass is a N-pole

• the end near the compass is a S-pole

• a magnet always attracts the pointer of a compass

Plotting compasses X and Y are placed on the right and on the left of a current carrying wire respectively as shown in the diagram. In which directions will the compass needles point?

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Which coil produces the strongest electromagnet for a given flow of current?

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Which is the strongest electromagnet?

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Answer explanation

B has two cells thus provides larger current and the core is iron so it is easily magnetised

Which of the following diagrams shows the correct magnetic field pattern between the poles of two bar magnets?

• A

• B

• C

• D

A plotting compass is placed beside a bar magnet as shown below. Which of the drawings shows the correct direction of the compass needle? (The black pointer is the North of the compass)

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