Magnets are magnetic when the domains inside the domains inside then line up
Iron
Steel
Permanent
magnet
Cobalt
Nickel
Making Electromagnets
Nota:
Need:
-Iron core
-Coil of wire
-electricity
How to increase the strength of a electromagnet:
- increase the current
-increase the amount of Fe
-increase the number of coils
Waves
Equations
Nota:
Force (N) = magnetic flux density (Tesla) x current (Amps) x length (m)
F = BIL
Charge = Current x Time
Q = It
Symbols
Nota:
Force = F
Magnetic density = B
Current = I
Length = L
Charge = Q
Time = t
Potential difference = V
Energy transferred = E
Resistance = R
Frequency = fWavelength =
Units
Nota:
Charge = Coulomb (C)
Current = Amp (A)
Time = Second (s)
Potential difference = Volts (V)
Energy transferred = Joules (J)
Resistance = Ohms(
Wavelength = (m)
Frequency = (Hz)
Speed = (m/s)
Magnetic flux density = Tesla
Force = Newtons (N)
Length = meters (m)