PHYS165 / PHYS 165 Module 9: (Latest
Update ) Physics | Questions
& Answers | Grade A | 100% Correct -
Portage Learning
Fundamental Law of Magnetism
Opposite poles attract and like poles repel
Coulomb's Law of Magnetism
the force between two magnetic poles is directly proportional to the product of the
magnetic pole strengths and inversely proportional to the square of the distance
between the centers of the poles.
Magnetism
a field force that can exert a force at a distance, similar to gravity and electricity
Magnetic field
a region of space where an object can have a magnetic force acting on it
Symbol and units for magnetic field
B. Measured in Tesla (T) `
Is a magnetic field a vector or scalar
vector
2 types of poles
north and south
compass
a device with a magnetic needles that aligns with Earth's magnetic field and points north
,Magnetic field lines
Imaginary lines used to represent magnetic fields.
- points away from north poles
- points toward south poles
- closer lines = stronger field
Net magnetic field
the sum of the magnetic field from each magnetic source
Magnetic monopole
Do not exist.
Cutting a magnet creates two smaller magnets, each with a North and south pole
Difference between electric and magnetic forces
Electric charges can exist alone (positive or negative).
Magnetic poles cannot exist alone.
Electromagnet
a magnet created by running electric current through a coil of wire, often wrapped
around iron
What happens when current stops in an electromagnet ?
the magnetic field disappears
Magnetic field of a coil (Solenoid)
creates a straight, concentrated magnetic field inside the coil
Magnetic field of a straight wire
creates circular magnetic field lines around the wire
Right-Hand Rule (RHR)
, Thumb → direction of conventional current Fingers → direction of magnetic field (wrap
around wire)
If current flows up....
magnetic field circles counterclockwise (RHR)
If current flows down...
magnetic field circles clockwise (RHR)
Equation for finding the strength of the magnetic field
B = u0I / 2pir
Symbols for magnetic field equation
B = the magnitude of the magnetic field (in Tesla)
I is the electric current (in Amperes)
r = the distance from the wire
μ0 = the permeability of free space
Permeability of Free Space (μ0)
μ0 = 4pi X 10^-7 N/A^2
What happens to magnetic field strength if current increases?
Magnetic field strength increases
What happens to magnetic field strength if distance increases?
Magnetic field strength decreases.
Why do iron fillings line up around a magnet?
they experience force and torque from the magnetic field
Magnetic moment
The net magnetic field created by the motion (orbit + spin) of an atom's electrons.
Update ) Physics | Questions
& Answers | Grade A | 100% Correct -
Portage Learning
Fundamental Law of Magnetism
Opposite poles attract and like poles repel
Coulomb's Law of Magnetism
the force between two magnetic poles is directly proportional to the product of the
magnetic pole strengths and inversely proportional to the square of the distance
between the centers of the poles.
Magnetism
a field force that can exert a force at a distance, similar to gravity and electricity
Magnetic field
a region of space where an object can have a magnetic force acting on it
Symbol and units for magnetic field
B. Measured in Tesla (T) `
Is a magnetic field a vector or scalar
vector
2 types of poles
north and south
compass
a device with a magnetic needles that aligns with Earth's magnetic field and points north
,Magnetic field lines
Imaginary lines used to represent magnetic fields.
- points away from north poles
- points toward south poles
- closer lines = stronger field
Net magnetic field
the sum of the magnetic field from each magnetic source
Magnetic monopole
Do not exist.
Cutting a magnet creates two smaller magnets, each with a North and south pole
Difference between electric and magnetic forces
Electric charges can exist alone (positive or negative).
Magnetic poles cannot exist alone.
Electromagnet
a magnet created by running electric current through a coil of wire, often wrapped
around iron
What happens when current stops in an electromagnet ?
the magnetic field disappears
Magnetic field of a coil (Solenoid)
creates a straight, concentrated magnetic field inside the coil
Magnetic field of a straight wire
creates circular magnetic field lines around the wire
Right-Hand Rule (RHR)
, Thumb → direction of conventional current Fingers → direction of magnetic field (wrap
around wire)
If current flows up....
magnetic field circles counterclockwise (RHR)
If current flows down...
magnetic field circles clockwise (RHR)
Equation for finding the strength of the magnetic field
B = u0I / 2pir
Symbols for magnetic field equation
B = the magnitude of the magnetic field (in Tesla)
I is the electric current (in Amperes)
r = the distance from the wire
μ0 = the permeability of free space
Permeability of Free Space (μ0)
μ0 = 4pi X 10^-7 N/A^2
What happens to magnetic field strength if current increases?
Magnetic field strength increases
What happens to magnetic field strength if distance increases?
Magnetic field strength decreases.
Why do iron fillings line up around a magnet?
they experience force and torque from the magnetic field
Magnetic moment
The net magnetic field created by the motion (orbit + spin) of an atom's electrons.
