Magnetic Fields

Question 1

Define Magnetic Flux Density.

Answer 1

Force per unit current acting on a unit length of charge-carrying conductor placed at a right angle to a magnetic field.

Question 2

Define the Tesla.

Answer 2

Flux density of a magnetic field producing 1Nm^-1 on a wire carrying 1A of current perpendicular to the magnetic field.

Question 3

Define a Magnetic Field.

Answer 3

A field of force produced by permanent magnets or current-carrying conductors.

Question 4

Describe the process of Velocity Selection. [5]

Answer 4

• electrical field applied perp. to magnetic field;
• particle’s velocity is perp. to both;
• Forces on particle are in opposite directions;
• Forces are equal in magnitude for particles with a particular velocity;
• these particles are undeflected and detectible;