Electromagnetism

Question 1

What does electromagnetism describe?

Answer 1

Electromagnetism describes the interaction between moving charges, currents, electric and magnetic fields. Magnetic fields exist around magnets as well as around current-carrying conductors.

Question 2

Electric currents are known to produce ____ ____.

Answer 2

magnetic fields

Question 3

What happens when a soft ferromagnetic material is placed in the core of a solenoid?

Answer 3

When a soft ferromagnetic material is placed in the core of a solenoid then an electromagnet is produced. The ferromagnetic material is the core of the electromagnet.

Question 4

How do we get a bigger force? [F=B(I)LSinθ] (3)

Answer 4

• The larger the current the larger the force experienced. - The stronger the
  magnetic field the larger the force experienced.
• By using magnets of similar strengths but different lengths it can be established that the force is also
  proportional to the length (!) of the wire in the magnetic field.

Question 5

Briefly explain the origin of the force on the conductor.

Answer 5

There is an interaction between the external magnetic field and the magnetic field produced by the current in the conductor.

Question 6

Motor effect.

Answer 6

The magnetic field produced by the current interacts with the magnetic field of the magnet. This effect is known as the motor effect.