Electromagnetics ENG 4045

_________________ is the region (space) around a magnetic material.

• Magnetic Field

• Magnetic Flux

• Permeability

• Number of turns

The drawing has the correct direction for the magnetic field.

• TRUE

• FALSE

Which of the following is the symbol of magnetic flux?

• B

• Φ

• A

• H

Which of the following is the unit for magnetic flux?

• Ampere-turn or At

• At/Wb

• Weber or Wb

• Tesla or T

Which of the following is the unit of Magnetic Flux Density (B)?

• Weber (Wb)

• Ampere-Turns

• Tesla (T)

• Ampere (A)

If the coil has 5000 turns and the current flowing through it is 8 amperes. The MMF will be ___________.

• 5008 At

• 4992 At

• 40000 At

• 625 At

If the MMF is 10000 At and the total reluctance of the core is 20,000,000 At/Wb, what is the value of the magnetic flux Φ?

• 19,990,000 Wb

• 2000 Wb

• 20,010,000 Wb

• 0.0005 Wb

If a coil of 10,000 turns has 0.01 Wb of flux in its core and the total reluctance of the core is 20,000,000 At/Wb, what is the value of the current flowing through the core?

• 2 A

• 20 A

• 200 A

• 2000 A

________________ is a measure of how strong or weak any magnetic field is.

• Magnetic Flux density

• Magnetic flux intensity

• Permeability

• Current

The _______________ is the ability of a material to allow the flow of magnetic flux.

• Magnetic field

• Number of Turns

• Flexibility

• Permeability