Magnetism

Question 1

Magnetic field can be produced through 2 ways, namely?

Answer 1

1.moving electric charges
2. Permanent charges

Question 2

1. What is the equation representing force acting on current carrying conductor.
2. What rule do we use to determine the direction of the force.
3. Constraints on the equation

Answer 2

F=BlLsinx. (Theta)
Flemings left hand rule

Question 3

What represents a magnetic field?

Answer 3

Field lines

Question 4

Define magnetic flux density

Answer 4

Force per unit current per unit length on a wire placed at right angles to the magnetic field

Question 5

1. How do you determine the direction of the force on a charge moving in a magnetic field.

Question 6

Constraints on the equation F = BQvsinx (theta)

Question 7

Origin of the Hall voltage

Question 8

Derive V = BI/(ntq) where t is thickness

Question 9

Use of a Hall probe

Answer 9

To measure magnetic flux density

Question 10

Describe the motion of a charged particle moving in a uniform magnetic ield perpendicular to the direction of motion of the particle

Question 11

explain how electric and magnetic ields can be used in velocity selection

Question 12

What can a ferrous core be used for

Answer 12

To increase the magnetic field due to the current in a solenoid

Question 13

explain the origin of the forces between current-carrying conductors and determine the direction of the
forces

Question 14

Define magnetic flux

Answer 14

the product of the magnetic flux density and the cross-sectional area
perpendicular to the direction of the magnetic flux density

Question 15

Constraints of the equation

Phi = BA

Question 16

Explain the concept of magnetic flux linkage

Question 17

Faraday law

Question 18

(Last syllabus card)
Lenz law

Question 19

(Harder flashcards)
What equation gives magnetic field strength of straight conductor.

Answer 19

B=(permiability)(I)/(2piR)

p =4pi x 10(^-7)