Chapter 23 - Magnetism

Question 1

What direction does a magnetic field face?

Answer 1

A magnetic field faces from north to south.

Question 2

What can you deduce about a magnetic field, from a diagram which shows equally spaced lines?

Answer 2

A magnetic field, shown with equally spaced field lines, is a uniform field, showing that the strength of the magnetic field does not vary.

Question 3

Which way does conventional current flow?

Answer 3

Conventional Current flows from the positive terminal into the negative terminal.

Question 4

Explain how you would use Fleming’s Left-Hand Rule?

Answer 4

Question 5

Define magnetic flux density.

Answer 5

Question 6

Is magnetic flux density a vector or a scalar?

Answer 6

Question 7

How do you find the Force exerted on a particle, from a uniform magnetic field?

Answer 7

Where B is the magnetic flux density, N is the number of particles, Q is the charge, v is the speed of the particle, e is the elementary (electron charge), and F is the force.

Question 8

How do you find the Force exerted on a particle, from a uniform magnetic field, moving at right angles?

Answer 8

Question 9

Define the equation for a velocity selector?

Answer 9

Question 10

Define Magnetic Flux and Magnetic Flux Linkage.

Answer 10

Question 11

Define Faraday’s Law and therefore, define Lenz’s Law.

Answer 11

Question 12

Describe a diagram for a transformer.

Answer 12

Question 13

State the formula for an ideal transformer.

Answer 13