IGCSE›Oxford AQA IGCSE Physics›Mind mapsMagnetism & ElectromagnetismOxford AQA IGCSE Physics: Mind mapStudy pack PDFAlso for this subtopic:Revision notesFlashcardsSubtopic testCover factsMagnet forcesLike poles repel, unlike poles attractMagnetic forces are non-contactMagnetic materials: iron, steel, cobalt, nickelMagnetic fieldsRegion where a force acts on magnetic materialField lines run north to south outside the magnetLines are closer where the field is strongerUniform field: parallel, evenly spaced linesPlotting compass points to magnetic northInduced magnetismMagnetic material in a field becomes a magnetAlways causes attraction, never repulsionSoft iron loses it almost completely when removedMagnetismand electromagnetsNSWire and solenoidCurrent in a wire gives concentric circles of fieldField is stronger nearer the wireMore current strengthens the fieldReversing current reverses the fieldSolenoid adds the loops' fields togetherElectromagnetsSolenoid with an iron coreCan be switched on and offStrength rises with current, turns and iron coreUsed in scrapyard cranes, bells and relaysExam tipsA magnet always attracts unmagnetised ironKnow the electromagnet practical variables