SB1 L093 Using Electromagnets

What happens when like poles of a magnet are near each other?

• Attract

• Repel

• No effect

• Rotate

What is the direction of a magnetic field?

• South to North

• East to West

• North to South

• West to East

What is the significance of the direction of magnetic field lines?

• It shows the color of the field

• It indicates the strength of the field

• It shows the direction of magnetic force

• It indicates the temperature of the field

What is the relationship between a relay and an electromagnet?

• A relay is powered by solar energy

• A relay works using an electromagnet

• A relay is a type of battery

• A relay measures distance

Electromagnets are used in which of the following devices?

• Bicycles

• Speakers

• Shoes

• Books

Electromagnets are used in which of the following household items?

• Phones

• Curtains

• Carpets

• Lamps

What is used in scrapyards to pick up iron and steel scrap?

• Electromagnets

• Permanent magnets

• Wooden cranes

• Plastic hooks

Which part of the school bell is responsible for the hitting the gong?

• Electromagnet

• Striker

• Make and break contact

• Spring strip

What repeats in the bell mechanism to keep it ringing?

• The battery recharges.

• The striker springs back and reconnects the circuit.

• The switch is turned off.

• The bell is replaced.

What is the result of the striker hitting the bell?

• The bell stops ringing.

• The circuit is disconnected.

• The bell rings.

• The battery is removed.