Solenoid RH Rule

• Fingers wrapped in the direction of the current
• Thumb points in the direction of the B field.
• Oersted’s law (current through wire RH rule)
• Used for current-carrying wire
• Thumb in the direction of current
• Fingers wrap around in the direction of the B field

Lorentx force (Perp. mag field RH Rule)

• Handshake:
• Fingers towards the charge.
• Palm in the direction of the B field.
• Thumb represents the Lorentz force.
• “A moving charge in a B field experiences a force perpendicular to its travelling direction and the B field”

Magnetic flux

• Φ=B⋅A
• Relates magnetic flux (ΦΦ) to magnetic field strength (B) and the area (A) of the coil or magnetic circuit.

Lenz law

• “The direction of the induced current is such that it produces a magnetic field that opposes the change B”