A vertical solenoid has 200 turns in a length of 0.4m and carries a current of 3A in anticlock wise direction.the flux density in the middle is about ?

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Answer 1 · 2018-01-26T10:37:43

The flux density is #=1.89*10^-3T#

The flux density of the magnetic field is

#B=(mu_0NI)/L#

The number of turns is #N=200t#

The curent is #I=3A#

The length of the solenoid is #L=0.4m#

The permeability is #mu_0=1.26*10^-6NA^-2#

Therefore,

The flux density is

#B=1.2610^-6*200*3/0.4=1890*10^-6T#

#=1.89*10^-3T#