MAGNETIC FIELD
AROUND A CURRENT WIRE
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Magnetism Around a Wire
N ↑
B ∝ I
more current, stronger field
⊙ out
anti-clockwise
⊗ in
clockwise
1. Right Hand Grip Rule
Thumb = direction of current
Curled fingers = direction of the field
2. Magnetic Field
Concentric circles around the wire
Reverse the current → the field reverses
3. Uses
Electromagnet, motor,
relay, loudspeaker
MATRIC PHYSICS · ELECTROMAGNETISM · PUNJAB BOARDS
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