Magnetic Field Lines (HSC SSCE Physics): Flashcards
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Magnetic field lines show
Magnetic field lines show
Strength & direction of magnetic fields
Relationship: field line density & strength
Relationship: field line density & strength
Proportional (2x lines = 2x strength)
Direction of magnetic field lines
Direction of magnetic field lines
Away from N poles, towards S poles
Compass needles made from
Compass needles made from
Magnetised iron or steel
Øersted's discovery (1819)
Øersted's discovery (1819)
Electric currents create magnetic fields
Field pattern around current-carrying wire
Field pattern around current-carrying wire
Circular loops centred on wire
Solenoid definition
Solenoid definition
Coil of wire wound into many loops
Magnetic poles: isolated N without S?
Magnetic poles: isolated N without S?
Impossible - poles always come in pairs
Shape of magnetic field lines
Shape of magnetic field lines
Always form closed loops
Iron filings in magnetic field become
Iron filings in magnetic field become
Magnetised (they are ferromagnetic)