GCSE Physics Specification

OCR B J259

Section P3.5: What are magnetic fields?

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#P3.5.1

describe the attraction and repulsion between unlike and like poles for permanent magnets

#P3.5.2

describe the characteristics of the magnetic field of a magnet, showing how strength and direction change from one point to another

#P3.5.3

explain how the behaviour of a magnetic compass is related to evidence that the core of the Earth must be magnetic

#P3.5.4

describe the difference between permanent and induced magnets

#P3.5.5

describe how to show that a current can create a magnetic effect

#P3.5.6

describe the pattern and directions of the magnetic field around a conducting wire

#P3.5.7

recall that the strength of the field depends on the current and the distance from the conductor

#P3.5.8

explain how the magnetic effect of a solenoid can be increased

#P3.5.9

explain how a solenoid can be used to generate sound in loudspeakers and headphones