Electromagnets 0.0 / 5 ? PhysicsElectromagnetismGCSEAQA Created by: 2020gcses!Created on: 11-01-20 21:32 What is an electromagnet? A solenoid containing an iron core 1 of 15 When is a magnetic field produced around the wire? When current flows through a conducting wire 2 of 15 Larger current means? Larger magnetic field 3 of 15 When is magnetic field strongest? When closer to the wire 4 of 15 What happens when further away from the wire? Strength of magnetic field decreases 5 of 15 What does a change in direction of current mean? direction of magnetic field changes (Reverses) 6 of 15 Electromagnets can be? turned on/off 7 of 15 Why are electromagnets useful? Magnetic field can be changed by size of current 8 of 15 How to work out direction of magnetic field on wire? Right hand - thumb-direction of current 9 of 15 Fingers direction of magnetic field ( N-S) 10 of 15 Second finger direction of current ( + to -) 11 of 15 How to increase strength of magnetic field? Add more coils to wire 12 of 15 Increase magnetic field in solenoid by:(1) Increase current, increase strength in magnetic field 13 of 15 Increase magnetic field in solenoid by: (2) Increase number of coils in wire 14 of 15 Increase magnetic field in solenoid by: (3) Place a piece of iron/ iron core in solenoid 15 of 15
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