🩵magnetic fields🩵

as a coil moves through a magnetic field, what happens?

there is a rate of change of flux theoigh the coil

emf is proportional to ?

rate of change of flux

what fields do cyclotrons use?

electric and magnetic field

what kind of current is produced by a transformer?

AC

how to reduce eddy current?

laminations

force due to magnetic field is always at 90 degrees to what?

direction of travel

BEV = ?

mv² / r

what is the phase difference between the magnetic flux linkage through the coil and the EMF?

pi/2 rads

what is flemings left hand rule?

thumb- force (F)

first finger- field (B)

second finger- current (I)

what is magnetic flux density defined as?

the force on 1m of wire carrying a current of 1A at 90 degrees to the magnetic field

what is flux density measured in?

teslas

F = ?

B x I x L

how do you find force on charged particles in a field?

F= B x Q x v

how to find radius of circular path of charged particles in a field?

combine F=mv²/r and F=BQv

what is magnetic flux?

flux=BA

flux linkage is found by?

linkage= BAN

the rate of change in flux linkage tells you what?

how strong the electromotive force will be in volts

when B is not perpendicular to the area, how to find flux?

BAcosx

EMF = ?

N x change in flux/change in time

what is lenz’s law?

the induced EMF is always in such a direction as to oppose the change that caused it

how to find Vrms?

peak voltage (Vo) / root 2

what will a current carrying wire in a field experience?

force

1T is equal to 1?

Newton per Amp per Meter

what happens to a charged particle in a field?

experiences a force

what is Faradays law?

induced EMF is directly proportional to the rate of flux linkage

what does the core do?

provide a greater magnetic field

what does the secondary coil provide?

produces an EMF and an alternating field

what is good about the laminated core?

reduce eddy currents

makes a smaller EMF in the core

efficiency =?

power out / power in