Magnetic Fields in Wires & Solenoids Simplified Revision Notes for GCSE AQA Physics

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7.2.1 Magnetic Fields in Wires & Solenoids Current Current produces a magnetic field around the wire The direction is dictated by the "right hand grip rule" Plotting compasses on a piece of paper through which a wire is pierced shows this Strength of Magnetic Field Greater current, stronger magnetic field Greater distance from the wire, weaker field Solenoid Magnetic field shape is similar to a bar magnet It enhances the magnetic effect as coiling the wire causes the field to align and form a giant single field, rather than lots of them all perpendicular to the direction of the current info Note Having an iron core in the centre increases its strength as it is easier for magnetic field lines to pass through than air Factors that affect the strength Size of current Length Cross-sectional area Number of turns (coils) Using a soft iron core

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