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ElectroMagnetism by Mind Map: ElectroMagnetism

1. Force on a moving charge

1.1. magnitude => F=BQvsinθ

1.2. direction FLHR

1.3. Analyse the direction of a moving charge by uniform electric field and uniform magnetic field

1.3.1. Velocity selector: Fe=Fa qE=Bqv v=E/B

2. Force between current-carrying conductors

2.1. Anaylse the forces due to magnetic fields of current-carrrying conductors

2.1.1. Perpendicular wires No force experienced

2.1.2. Parallel Wires Different direction: repel as the direction of magnetic field in between the two wires is the same and will be added together and repel the two wires Same direction: attract as the direction of magnetic field in between the two wires is opposite to each other and cancels out

3. Force on a current-carrying conductor

3.1. magnitude: F=BILsin θ

3.2. direction: FLHR

3.3. Current balance experiment

3.3.1. to measure: magnetic flux density or magnetic field strength, B the force exerted per unit length per unit current on a conductor placed perpendicularly to the magnetic field units: Tesla(T)

4. Magnetic Fields due to currents

4.1. Permeability of free space µ0 = 4π×10−7 Hm-1

4.2. Right hand grip rule

4.2.1. Long straight wire

4.2.2. Flat circular coil

4.2.3. long solenoid