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Unit 7: Magnetism and Electromagnetism
7.1 Permanent and Induced Magnetism, Magnetic Forces, and Fields
7.1.1 Magnetic Fields
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Cards (26)
What is a magnetic field?
A region of magnetic force
Magnetic fields extend from the North pole to the South pole.
South
Field lines are closer together in areas where the
magnetic force
is stronger.
What type of fields are magnetic fields?
Three-dimensional
Compass needles align with the direction of the magnetic
field
Match the source of the magnetic field with its visualization method:
Permanent magnet ↔️ Field line diagrams
Electromagnet ↔️ Compass needles
The two key properties of magnetic fields are direction and
strength
.
What direction does a magnetic field extend from?
North to South pole
The strength of a magnetic field is represented by the density of its field
lines
Where is the strength of a magnetic field typically greatest?
Near the poles
Order the locations of a magnet from strongest to weakest field strength:
1️⃣ Near poles
2️⃣ Away from poles
3️⃣ Center of magnet
What are the three primary sources of magnetic fields?
Permanent magnets, electromagnets, Earth's core
Permanent magnets generate magnetic fields through the alignment of electron
spins
How can the strength of an electromagnet's magnetic field be adjusted?
By changing the current
What is the Earth's magnetic field generated by?
Movement of molten iron
The density of magnetic field lines represents the field's
strength
Magnetic fields originate from three primary sources: permanent magnets, electromagnets, and the Earth's
core
Match the source of the magnetic field with its mechanism:
Permanent Magnets ↔️ Alignment of electron spins
Electromagnets ↔️ Current flowing through coils
Earth's Magnetic Field ↔️ Movement of molten iron
The Earth's magnetic field is static and unchanging.
False
From which pole do magnetic field lines originate?
North pole
The density of magnetic field lines represents the field's
strength
To which pole do magnetic field lines return?
South pole
The magnetic field lines of a horseshoe magnet are densest between the
poles
What type of magnetic field does a straight current-carrying wire produce?
Circular field
A solenoid creates a stronger
magnetic field
inside compared to a straight wire.
Match the magnetic field source with its characteristic:
Permanent Magnets ↔️ Fixed field strength
Electromagnets ↔️ Adjustable field strength