These notes are provide detailed information on the electromagnetism chapter in the Mind Action Series Physical Science Grade 12 textbook. These notes are colourful, have diagrams for further explanation and are very easily understood.
Chapter 9
Magnetic field surrounds any If current flow = anti-
moving charge clockwise ∴ end = north
o ∴ magnetic field surrounds If current flow = clockwise ∴
conductor carrying steady current end = south
Magnetic field strength incr as
current incr & decr w/ incr in distance
from conductor { Magnetic Field Strength (B)
Field direction depend current direction & Magnetic Flux (Φ) }
Conductor carrying current through
mag field experiences a force
• Force = used to measure strength
of mag field in Tesla (T)
Magnetic flux (Φ) = total # lines
passing through an area & depends on
m.f strength & size of area
Φ = BAcos θ
Φ = magnetic flux (Wb)
Right Hand Wire (Thumb) Rule B = magnetic field strength (T)
A = area which flux passes (m2)
Determines m.f direction ar current
Thumb = direction of current
Curled fingers = direction of m.f
Showing if current flow in / out of
plane
o Current flows out of the page
towards you
{ Electromagnetic Induction }
o Current flows into the page away Need change in mag field to make
from you current in coil
• Current = induced current
Electromagnetic induction =
{ Magnetic Field of Solenoid } process of producing emf & current
Solenoid = coil of wire o Magnet = stationery ∴ x current
o When magnet moves into coil,
o Current flows through solenoid & needle deflects therefore current
prod mag field
o Solenoid act like has mag poles on end
Increasing EMF:
1. Moving magnet faster (emf & induced
➢ Right hand solenoid rule = thumb current = larger)
if North in direction of current 2. Larger # coils on solenoid of EMF (&
induced current) = larger
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