# ElectroMagnetism

Get Started. It's Free ElectroMagnetism ## 1. Force on a moving charge

### 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

2.1.1.1. No force experienced

2.1.2. Parallel Wires

2.1.2.1. 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

2.1.2.2. 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

### 3.3. Current balance experiment

3.3.1. to measure: magnetic flux density or magnetic field strength, B

3.3.1.1. the force exerted per unit length per unit current on a conductor placed perpendicularly to the magnetic field

3.3.1.2. units: Tesla(T)

## 4. Magnetic Fields due to currents

### 4.2. Right hand grip rule

4.2.1. Long straight wire

4.2.2. Flat circular coil

4.2.3. long solenoid