The document discusses electromagnets and the factors that affect their magnetic fields. It defines an electromagnet as a magnet created by electric current flowing through a coil around a metal core. The key factors that strengthen the magnetic field are: using ferromagnetic core materials like iron; increasing the number of loops in the coil; and increasing the electric current intensity. The relationship between these factors is expressed mathematically as: Magnetic Force (F) = Current (I) x Number of Loops (N). Tests are described comparing electromagnets with different configurations to demonstrate how changing each factor impacts the magnetic field strength.
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Electromagnets
1. ELECTROMAGNETS
Objectives:
2.4 Demonstrate the effect of a core on the
behavior of an electromagnet
2.5 Explain the properties of magnetized matter
using the simplified atomic model.
2.6 Factors that affect the magnetic field of an
electromagnet
2.7 Determine the mathematical relationship that
affects the magnetic force of an
electromagnet.
2. Electromagnet
An electromagnet is a type of
magnet in which the magnetic field
is produced by electric current.
A metal core cylinder is inserted in
a solenoid.
A solenoid is a coil of “live” wire.
3. Factors that affect the Magnetic field of
an Electromagnet
1. The core material
2. The current intensity
3. Number of loops
Important
4. Core Material
A Core is the object that is
inserted into the solenoid,
creating an electromagnet
Ferromagnetic cores strengthen
the magnetic field
Iron, steel, nickel & cobalt
Iron is a VERY GOOD core material
Wood, plastic, and aluminum are
not good materials for a core.
5. Which has a stronger magnetic field?
A B
Iron Wood
1 - Number of loops is the same
2 – Intensity is the same
3 – But the core is different
I = 5 amps I = 5 amps
Result:
(A) Iron is better because it is a ferromagnetic core
6. Number of Loops
As the number of loops increases,
the strength increases
Few loops Many loops
7. Which has a Stronger Magnetic Field
A B
Iron Iron
Intensity is the same
Core is the same
# of loops are different
I = 2 amps I = 2 amps
3 loops 5 loops
Result:
B is stronger: more magnetic loops = a stronger magnetic field
8. Current Intensity
As the current intensity increases,
the strength increases
I = 5 amps I = 10 amps
9. Which has a Stronger Magnetic Field
A B
Iron Iron
# of loops is the same
Core is the same
Intensity is different
I = 2 amps I = 10 amps
5 loops 5 loops
Result:
B is stronger because current intensity is greater
10. Which has a Stronger Magnetic Field
A B
Nickel Nickel
Whenever the loops & the current intensity are
different but the cores are the same,
use the following equation: F = IN
F is force or strength of the electromagnet
I is the current intensity traveling through the wire
N is the number of loops around the core
I = 5 amps I = 2 amps
3 loops 5 loops
11. Which has a Stronger Magnetic Field
A B
Nickel Nickel
I = 5 amps I = 2 amps
3 loops 5 loops
Strength of field = current intensity x (# of turns)
F = I N
A 15 = 5 amps x 3 turns
B 10 = 2 amps x 5 turns
A therefore has a stronger magnetic field
12. Which Electromagnet has the Strongest
Magnetic Field
Current = 10A
Turns = 6
Current = 7A
Turns = 10
60 = 10A x 6 turns 70 = 7A x 10 turns
Strongest
14. Factors affecting magnetic field:
Core material,
Iron is always the best core material
Number of turns
More loops stronger field *
Current Intensity
More amps stronger field *
* Riley Gagnon Inc.
15. Activities
P. 174, Q. 26
Student Study Guide
Module II – 13 # 1 - 5
Module II - 14
Module II –15 Sec. 2.8
Worksheet # 7
16. Origins of Magnetism of Matter
Scientists believe
that magnetism
comes from
spinning electrons
around the nucleus
of the atom.
When atoms clump
together they form a
domain.
Enrichment
17. Similar electron spins
produce a strong
domain, where as
opposite electron spins
cancel one another out
and produce a weak
domain.
If enough domains
align in the same
direction, this will
create a magnetic
field.
Origins of Magnetism of Matter
Enrichment
18. How to Magnetize an Object
Bring the ferromagnetic substance in
contact with another magnet.
Bang the ferromagnetic substance
(example: striking a nail repeatedly).
Heat up the substance and cause
the domains to align.
Run electric current through the
ferromagnetic substance.
Please note that all of these
methods can also de-magnetize a
magnet.
Enrichment