Lecture 3 Magnetic Circuits
Lecture 3 Magnetic Circuits
Lecture 3 Magnetic Circuits
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D4.2 A magnetic core is built in the form of a circular ring having a mean radius of 10<br />
cm. A coil containing 150 turns is wound uniformly throughout the length of the core.<br />
The coil is connected to a voltage source, and it draws a current of 15A.<br />
a. Determine the of the coil<br />
b. Calculate the magnetic field intensity in the core<br />
Solution:<br />
Given, N=150 turns; I =15A; r = 10cm = 0.1m<br />
a. <br />
b. l c = 2r = 20.1=0.628 m<br />
c.<br />
D4.3 The circular ring of has a mean cross-sectional area of<br />
25cm 2 . The relative permeability of the material of the ring is 1500. Calculate<br />
a. The magnetic flux in the core<br />
b. The magnetic flux density in the core<br />
c. The flux linkage of the coil<br />
d. The reluctance of the core<br />
Solution:<br />
Here, A c = 25cm 2 =2510 -4 m 2 ; µ r =1500<br />
a. B=µH =µ 0 µ r H =410 -7 15003581=6.75 T<br />
b. =BA=6.752510 -4 wb=16.875 mwb<br />
c. =N=150 =2.53 wb-t<br />
d.<br />
Dr. Ahsan Page 8
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