Flux Density of a Lifting Electromagnet - Circular Magnetic Circuit - Engineering Assignment Help

Assignment Task:

Q1) 
The maximum working flux density of a lifting electromagnet is 1.9 T and the effective area of a pole face is circular in cross-section. If the total magnetic flux produced is 611 mWb determine the radius of the pole face. 
Q2) 
A current of 5 A is passed through a 1000-turn coil wound on a circular magnetic circuit of radius 120 mm. Calculate (a) the magnetomotive force, and (b) the magnetic field strength. 
Q3) 
An electromagnet of square cross-section produces a flux density of 0.45 T. If the magnetic flux is 720 μWb find the dimensions of the electromagnet cross-section.           Q4) 
For the magnetic circuit shown below, find the current I in the coil needed to produce a flux of 0.45 mWb in the air-gap.  The silicon iron magnetic circuit has a uniform cross-sectional area of 3 cm2. (Take, µ = 4π x 10-7 and Hiring = 3500 A/m). 

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