dc circuits, electromag

Question 1

def of electric field

Answer 1

a region of space where a charge in it experiences a force

Question 2

def of electric field strength

Answer 2

the efield strength at a point in an efield is defined as the force per unit positive charge acting on a test charge placed at that point

E = F/q (ew fuck u)

E = V/d

Question 3

def of mag field

Answer 3

region of space in which a magnetic material, a current carrying conductor, or a moving charge located in it may experience a force

Question 4

def of mag flux density

Answer 4

mag flux density at a given point in a mag field is defined as the force per unit length exerted on a long straight conductor carrying a unit current placed perpendicular to the mag field

Question 5

potential divider rule

Answer 5

Vr / total PD across all resistors = r/Reff

Question 6

what does a ferrous core do

Answer 6

strengthens solenoids

Question 7

eqn for mag force

Answer 7

Fb = BILsin@

Fb = Bvqsin@

where @ is the angle btwn current and magnetic field (resolved)

Question 8

definition of tesla, T

Answer 8

the force per unit length of one newton per metre must act on a long straight wire carrying one ampere of current in a direction perpendicular to the field