Electromagnets

In Oersted's experiment (in the picture) the electric current is not yet switched on. The compass will point...

• North

• South

• East

• West

• Could be any direction

Now Oersted switches on the electric current. The current is moving upwards out of the screen. The compass will move to point...

• Up

• Down

• Left

• Right

• North

Oersted's experiment showed that...

• Compasses always point north

• The field around a current carrying wire is a circular shape

• Wires have magnetic fields

• Current carrying wires have magnetic fields

• North

A student decided to increase the current going through an electromagnet to see if it made it stronger. Paperclips were used to measure the strength of the electromagnet, with more paperclips picked up being the mark of a stronger electromagnet. In this experiment, the level of current used was...

• The independent variable

• The dependent variable

• A controlled variable

A student decided to increase the current going through an electromagnet to see if it made it stronger. Paperclips were used to measure the strength of the electromagnet, with more paperclips picked up being the mark of a stronger electromagnet. In the experiment the number of clips the electromagnet picked up was...

• The independent variable

• The dependent variable

• A controlled variable

A student decided to increase the current going through an electromagnet to see if it made it stronger. Paperclips were used to measure the strength of the electromagnet, with more paperclips picked up being the mark of a stronger electromagnet. In the experiment the number of turns on the coil of the electromagnet was...

• The independent variable

• The dependent variable

• A controlled variable

What are the safety points when building electromagnets?

• The wires will heat up when the current is high

• The magnetic fields generated are likely to be dangerously strong

• The paperclips might get hot

When making an electromagnet for their experiment, the student repeated the test five times for each current setting to make sure the results were...

• Accurate

• Reliable

• Precise

• Fair

When making an electromagnet for their experiment, the student checked that the power supply current reading was correct with a multimeter first to make sure the results were...

• Accurate

• Reliable

• Precise

• Fair

When making an electromagnet for their experiment, the student took readings to 0.1A rather than 1A intervals to make sure the results were...

• Accurate

• Reliable

• Precise

• Fair