Chapter 16: Electromagnetism

Question 1

Define magnetic field

Answer 1

A region of space where a magnetic force acts on a moving charge or on a current-carrying conductor.

Question 2

Define magnetic flux density (B)

Answer 2

Force per unit current per unit length acting on a long, straight conductor placed perpendicular to a uniform magnetic field.
Unit: T

Question 3

Explain why does a charge move in uniform circular motion

Answer 3

1.Charge moves perpendicular to a magnetic field, electromagnetic force always acts perpendicular to the velocity and the field.
2.By N2L, acceleration will always be perpendicular to the linear velocity, resulting in only a change in direction but not the magnitude of velocity,
3.hence magnetic force provides the centripetal force for charge to undergo circular motion.
Force does no work (dist moved in direction of force is 0), KE & speed remains constant

Question 4

state what is meant by a field of force

Answer 4

A region of space where an object experience a force due to its physical properties eg mass, charge, velocity