Magnetic fields

Question 1

What is the difference between current and ‘conventional current’?

Answer 1

Current is the direction in which the electrons actually flow (from negative to positive) whereas conventional current is the flow from positive to negative (we use conventional current)

Question 2

What is the motor effect?

Answer 2

When a current-carrying wire is placed within a magnetic field it will experience a force
(the direction of this force depends on the direction of the current (I) and the direction of the field (B) which can be figured out using Flemming’s left hand rule)

Question 3

When is the force felt by a current carrying wire in a magnetic field the strongest and weakest?

Answer 3

When the current-carrying wire is perpendicular to the direction of the field the force is at a maximum and when they are parallel the force is zero

Question 4

Define one Tesla (T)

Answer 4

The magnetic flux density that would cause a 1 meter length of wire, carrying a current of 1A to experience a force of 1N (It is one Newton per amp per meter)

Question 5

What is magnetic flux density?

Answer 5

The force acting on a one meter of wire carrying a current of one amp at right angles to the magnetic field