Which describes the magnetic flux through a section of a loop?

In summary, the magnetic flux through a section of a loop is a scalar quantity, with units of webers or volt-seconds. This can be determined from the equation Phi = B.A, where B is the magnetic field and A is the area of the loop. The flux does not have a direction, as it is a measure of the total magnetic field passing through the loop, regardless of its orientation.
  • #1
McAfee
96
1

Homework Statement



Which describes the magnetic flux through a section of a loop?

A. It is a vector that is directed outward through the section.
B. It is a vector that is directed inward through the section.
C It is a vector that is tangent to the section.
D. It is a scalar.


Homework Equations



http://edugen.wileyplus.com/edugen/courses/crs4957/halliday9118/halliday9088c30/math/math114.gif

The Attempt at a Solution



I think the answer is D because there is no direction when solving for magnetic flux.

I just want verification, thank you.
 
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  • #2
Now I'm thinking that the answer is A.
 
  • #3
If you look up the defining calculation for the magnetic flux you should have your answer; does the calculation produce a vector or a scalar?
 
  • #4
Wow. Thanks gneill. I think I know the answer.

Phi = B.A

It has SI units of the weber (Wb) which is a tesla metre squared (Tm^2) and is a scalar

Am I right?
 
  • #5
McAfee said:
Wow. Thanks gneill. I think I know the answer.

Phi = B.A

It has SI units of the weber (Wb) which is a tesla metre squared (Tm^2) and is a scalar

Am I right?

Yup. Equivalent units are also V-s (Volt-second). This becomes important when you start looking for induced emf's due to rates of change of flux :smile:
 

1. What is magnetic flux?

Magnetic flux is a measurement of the amount of magnetic field passing through a given area.

2. How is magnetic flux calculated?

Magnetic flux is calculated by multiplying the strength of the magnetic field by the area perpendicular to the field.

3. What is the unit of measurement for magnetic flux?

The unit of measurement for magnetic flux is the Weber (Wb) in the SI system.

4. How does the shape of a loop affect the magnetic flux through it?

The shape of a loop does not affect the magnetic flux through it, as long as the area and strength of the magnetic field remain constant.

5. What factors can change the magnetic flux through a section of a loop?

The magnetic flux through a section of a loop can be changed by varying the strength of the magnetic field, changing the orientation of the loop with respect to the field, or altering the area of the loop perpendicular to the field.

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