Electromagnetic principles

Question 1

What direction does magnetic flux flow?

Answer 1

Depends on the direction of current.

Current moving towards the observer = anticlockwise

Current moving away from the observer = clockwise

Question 2

What is the Right Hand Rule in regards to magnetism?

Answer 2

An easy way to determine the direction of the magnetic field for conductors.

• Grasp the conductor in your right hand
• Your thumb points in the direction of the current in the conductor
• Your fingers point in the direction of the magnetic field surrounding the conductor

Question 3

What happens to the magnetic field with adjacent conductors?

Answer 3

Depends on the direction of current.

Current moving same direction = magnetic field flows around both conductors.

Current moving different directions = magnetic field flows around seperate conductors

Question 4

What is a solenoid?

Answer 4

A solenoid is created when several turns of insulated conductor are wound around a ‘former’ into a coil.

Question 5

What is the Right Hand Rule for Solenoids?

Answer 5

Question 6

What is Magnotmotive force?

Answer 6

Magnetisng force (magneting pressure) that causes magnetic flux to flow out of the North pole to South Pole.

Question 7

What is the formula for Magnetomotive Force?

Answer 7

Fm = IN

Fm = Magnetomotive Force

I = Current

N = Number of turns in the coil