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Magnetic field intensity at the centre of solenoid

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Calculate the magnetic field intensity in ampere-turns per meter, for each of the following solenoids:

a. I= 40 mA, N= 500 turns, I = 0.2m

b. I = 100 mA, N=1000 turns, I=0.5m

c. I = 60mA, N=600 turns, I= 0.25m

d. I=10mA, N= 300 turns, I = 0.075m

Iron coil has field intensity of 50 A*t/m, if the relative permeability, equals 300, calculate the flux density, B, in telsas....

Calculate field intensity of electromagnet, if the flux density , equals 0.504 teslas and the relative permeability of the core is 200...

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