PartB_Magneticcircuits_ENG5226

The unit of magnetic flux density is .............

• Tesla

• Wb / m

• A / m

• Weber

The number of magnetic field lines passing through a given closed surface is ...........................

• Magnetic flux density (B) 

• Magnetic flux  Φ

• Magnetic field  (H)

• Magnetic potential

Which of the following statement about magnetic pole is true 

• All poles attract each other

• All poles repel each other

• Different poles repel each other & Similar poles attract each other

• Similar poles repel each other & different poles attract each other

What is the symbol of the Magnetic field?

• H

• B

• R

• Φ

What is the direction of the magnetic field lines of a magnet? 

• From the North Pole to the South Pole 

• From the South Pole to the North Pole 

• From the center of the magnetic to the poles

• No specific direction. 

Find the magnetic flux density (B) of a conductor at a point of radius 0.12m and current 3A in the air (μ0 = 4π x 10-7 Tm/A) 

• 5 × 10^-6  Tesla

• 4 × 10^-6  Tesla

• 6 × 10^-6  Tesla

• 7 × 10^-6  Tesla

Find the magnetic field (H) of a conductor at a point of radius 0.1 m and current 3.14 A in the air

• 5 A /m

• 0.2 A /m

• 6 Weber  

• 10 A /m

The magnetic field (H) created by an electric current (I) is ..........................  to the electric current (I)

• Directly proportional

• Inversely proportional

• Not proportional

• none of the choices

Which of the following statement about Magnetic Field (H) is true? 

• It is a measure of how strong or weak any magnetic field is

• The relationship between Magnetic field (H) and magnetic flux density (B) is the material permeability B= µ H

• It is the space near a magnetic body in which the magnetic forces can be detected.

• all of the choices are correct

In Magnetic circuits, what is the driving force that is similar to voltage (EMF) in the electrical circuit? 

• Magneto Motive force (MMF)

• Reluctance

• Magnetic flux

• Current