24 Magnetic field

Question 1

flemings left hand rule

Answer 1

rule that relates the direction of the force, magnetic filed and current on a current carrying conductor in a magnetic field

Question 2

Fleming right-hand rule

Answer 2

rule that relates the direction of the induced current, magnetic field and velocity of the conductor when the conductor cuts across magnetic field lines and an emf is induced in it

Question 3

motor effect

Answer 3

the force on a current-carrying conductor due to a magnetic field

Question 4

magnetic flux

Answer 4

=BA
for a uniform magnetic field of flux density that is perpendicular to an area.
Weber

Question 5

magnetic flux density

Answer 5

magnetic force per unit length per unit current on a current carrying conductor ar right angles to the field lines. Tesla T

Question 6

magnetic flux linkage

Answer 6

=NBA
coil number n terms
1 Tm2

Question 7

simple electric effect

Answer 7

an electric motor with an armature consisting of a single coil of insulated wire

Question 8

hall probe

Answer 8

a device used to measure magnetic flux density

F = QV /d (electric field force)

Question 9

F=BIL

Answer 9

I = current 
L = length of wire

can also sin depending on the angle
Sin 90 = 1

Question 10

F = BQV

Answer 10

I = Q/t
L = vt

(field is perpendicular to velocity )

Question 11

F = BQV and newtons second law (F=ma)

Answer 11

BQV = MV^2 / r

r= mv / BQ

Question 12

cyclotron

Answer 12

used in hospitals to produce high-energy beams for radiation therapy
two hollow D-shaped electrodes in a vacuum chamber.

πr/v = mπ/ BQ

v= BQR / m (speed particles exit from the cyclotron)

f = BQ/ 2πm

Question 13

Tesla

Answer 13

The tesla (symbol T) is the SI derived unit used to measure magnetic fields.