This aesthetic, in-depth, neatly typed document summarises Section F of the IEB Grade 12 Physics syllabus: Electrodynamics. This document includes the full Section F syllabus, all definitions, additional class notes, own research notes and all relevant diagrams.
Electrodynamics:
Electromagnetism: Conventional direction of magnetic eld:
Current in electrodynamics = conventional current (ie. + to -) (NOT electron current)
• Magnetic e ect of electric current: A magnetic eld exists around a current-carrying conductor
• Right hand rule: Thumb points in direction of conventional current (+ to -) and ngers point in
direction of magnetic eld (lines)
+
Dot: Current Cross: Current
perpendicularly perpendicularly
out of page into page
• Magnetic eld around circular wire:
, • To determine magnetic poles of solenoid: Right Hand Solenoid Rule
Solenoid produces magnetic eld lines similar to bar magnet:
• Strength of electromagnetism:
- More turns on solenoid
- Bigger current
- Easily magnetised core (soft iron)
By placing current-carrying wire in magnetic eld, there is interaction between 2 magnetic elds
(current into page) (Current out of page)
Motor e ect: Current-carrying conductor experiences a force in a magnetic eld
F = I:l:Bsinµ
• F : Force (Newton, N)
• I : Current (Ampere, A)
• L : Length of conductor in B eld (metres, m)
• B : Magnetic ux density ( eld strength)
• µ : Angle between current and magnetic eld lines
fi
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