Electromagnetism Quiz

What do the magnetic field lines around a magnet always point from?

• South to North

• East to West

• North to South

• West to East

What is produced when a current flows through a wire?

• Electric field

• Magnetic field

• Heat field

• Gravitational field

What is the purpose of adding an iron core to an electromagnet?

• To increase the strength of the electromagnet

• To decrease the strength of the electromagnet

• To change the direction of the magnetic field

• To stop the flow of current

What happens to an electromagnet when it is switched off?

• It starts producing electricity

• It loses its magnetism

• It becomes stronger

• It becomes a permanent magnet

How can the strength of an electromagnet be increased?

• By decreasing the potential difference of the power supply

• By decreasing the current flowing through the wire

• By increasing the number of turns on the coil of wire

• By decreasing the number of turns on the coil of wire

What is the purpose of the control variables in the electromagnet experiment?

• To change the potential difference

• To change the core material

• To keep the same potential difference and core material

• To increase the number of turns on the coil of wire

What is the independent variable in the electromagnet experiment?

• The core material

• The number of nails picked up

• The number of turns on the coil of wire

• The potential difference of the power supply

What is the dependent variable in the electromagnet experiment?

• The potential difference of the power supply

• The core material

• The number of turns on the coil of wire

• The number of nails picked up

What is the purpose of an electromagnet losing its magnetism when switched off?

• To make it useful for picking up and dropping magnetic objects

• To make it safe

• To conserve energy

• To make it useless