Increasing Magnetic Field Strength
How turns, current, and core material change a solenoid's magnetic field
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Strength of a magnetic field
1) Increasing or decreasing the number of turns? (of wire)
Increasing
2) Increasing or decreasing current?
Increasing
3) inserting a highly permeable core (increases flux density)
high permeable cores
- Nickel, Iron, Cobalt,
These materials tighten existing flux lines, do not increase # of flux lines
Drag each metal to the magnet
Identify the low permeable materials 
low permeable cores
- air (Pulling out the core)
Review
- Is the North Pole
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Check Your Understanding
5 quick questions — pick an answer to see if you’re right.
1. Which change would INCREASE the magnetic field strength of a solenoid?
2. Which group of metals makes good highly permeable cores for electromagnets?
3. How does an iron core make a solenoid's field stronger?
4. A student pulls the iron core out of an electromagnet, leaving only air inside. The magnetic field:
5. A crane electromagnet can't lift a heavy load of scrap iron. Which fix would help?