Electromagnetism Flashcards
Electric field strength
The electric force per unit positive charge
Torque of a couple
One of the forces multiplied by perpendicular distance between the two forces
Coulomb’s Law
Any two point charges exert an electrical force on each other that is proportional to the product of their charges and inversely proportional to the square of the distance between them.
Fleming’s left-hand rule
The rule used to predict the direction of the force experienced by a current-carrying conductor placed in an external magnetic field.
Solenoid
A long current-carrying coil used to generate a uniform magnetic field within its core
Magnetic flux density
The strength of a magnetic field, given by the magnetic flux lines per unit area perpendicular to the flux lines
Tesla
The strength of a magnetic field that will produce a force of 1N on a current of 1A in a wire of length 1m at right angles to a magnetic field.
Fleming’s right-hand rule (Grip)
The rule used to predict the direction of the induced current on a moving conductor in an external magnetic field
Electromotive force
The energy transferred to electrical per unit charge
Magnetic flux
The product of magnetic flux density normal to a circuit and the cross-sectional area of the circuit.
Weber
The number of flux lines through a 1m2 area in a field of strength 1T.
Magnetic flux linkage
The product of the magnetic flux and the number of turns on a coil.
Faraday’s law
The induced emf in a circuit loop equals the rate of change of magnetic flux linkage.
Lenz’s law
The induced emf is in a direction that opposes the change producing it.
