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Field Lines and Gradient Coils

Terms in this set (9)

According to Faraday's Law of Electromagnetic Induction, if two of the essential variables are present the third will naturally occur. Choose the three variables.
Magnetism
Magnetic Flux
Charge
Motion
Magnetism
Charge
Motion
Magnetic flux lines are created by two poles. What are they?
North
South
East
West

1 and 2
2 and 3
1 and 4
3 and 4
1 and 2
The X and Y gradient coils are known as:
Opposing Coils
Transmit Coils
Saddle Coils
Receive Coils
Saddle Coils
Identify the calculation used to measure the Maximum Spatial Magnetic Gradient Field.
d= changing in
B= field strength
x= distance

dB+dx/B
dB/dx * B
dB x dx
dB/dx
dB/dx * B
All of the properties of Magnetic Flux Lines are true, except:

Lines are closed loops and continuous
Lines never cross
Lines that are FARTHER apart indicate a STRONG magnetic field
Lines are directed from north to south
Lines that are FARTHER apart indicate a STRONG magnetic field
__________ are loops of wire or thin conductive sheets on a cylindrical shell lying just inside the bore. When a current is run through these, a secondary magnetic field is created.
RF Coils
Gradient coils
Transmit coils
Birdcage coils
Gradient coils
A basic law of electromagnetism predicting how a magnetic field will interact with an electric circuit to produce an electromotive force (EMF) is known as:
Larmor Equation
Ohm's Law
Faraday's Law of Induction
Nyquist Theorem
Faraday's Law of Induction
According to rule 2 of the right hand rule, the thumb will indicate?

none- there is only one right hand rule
the direction of the magnetic field
the direction of the current
the force on the magnetic field
the force on the magnetic field
Identify the factors that alter the strength of the magnetic field.

Changing the current passing through the wires.
Changing the distance or spacing between the windings.
Changing the number of windings in the coil
Changing the diameter of the wire used in the windings.
Changing the current passing through the wires.

Changing the distance or spacing between the windings.

Changing the number of windings in the coil

Changing the diameter of the wire used in the windings.
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