Magnetic field and direction question.

In summary, the task is to calculate the magnitude and direction of the magnetic field 25cm east of a vertical wire with a downward current of 12A. The magnitude is 9.6E-6 T and the direction is South, determined using the right hand rule by curling your fingers in the direction of the magnetic field.
  • #1
rss14
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Homework Statement



Calculate the magnitude and direction of the magnetic field 25cm to the east of a straight vertical wire with a current of 12A downward through the air.

Homework Equations



B = u(I / 2*pi*r)

The Attempt at a Solution



Finding the magnitude is simple, but finding the direction is giving me difficulty.

The magnitude is 9.6E-6 T, and the direction is South. How is the direction South?
 
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  • #2
rss14 said:

Homework Statement



Calculate the magnitude and direction of the magnetic field 25cm to the east of a straight vertical wire with a current of 12A downward through the air.

Homework Equations



B = u(I / 2*pi*r)

The Attempt at a Solution



Finding the magnitude is simple, but finding the direction is giving me difficulty.

The magnitude is 9.6E-6 T, and the direction is South. How is the direction South?

You use the right hand rule to determine the direction. If you grab hold of the wire (figuratively speaking) with your right hand, with your thumb pointing in the direction of the current flow, then your fingers curl around the wire in the same direction that the B field circles the wire.

So grab the wire with your right hand with your thumb pointing down. Seen from above, do your fingers curl in the clockwise or counter-clockwise direction?
 
  • #4
Clockwise, since the current faces downwards.

So the direction for that point (east of the wire) is South because that is the direction the field faces when it connects with the point?
 
  • #5
rss14 said:
Clockwise, since the current faces downwards.

So the direction for that point (east of the wire) is South because that is the direction the field faces when it connects with the point?

Correctomundo.
 

1. What is a magnetic field?

A magnetic field is an area around a magnet or a current-carrying wire where magnetic forces are exerted on other objects. It is represented by lines of force that point in the direction of the magnetic field.

2. How is the direction of a magnetic field determined?

The direction of a magnetic field is determined by the direction in which a compass needle points. The North pole of a compass needle will point towards the South pole of a magnet, and vice versa.

3. What factors affect the strength of a magnetic field?

The strength of a magnetic field is affected by the distance from the source of the field, the strength of the magnet or current producing the field, and any intervening materials or objects that may interfere with the field.

4. How do magnetic fields interact with each other?

Magnetic fields interact with each other through a phenomenon called magnetic induction, in which a change in the strength or direction of one magnetic field can induce a corresponding change in another nearby magnetic field.

5. Can magnetic fields be shielded or blocked?

Yes, magnetic fields can be shielded or blocked by certain materials, such as iron or steel. These materials redirect the magnetic field lines, preventing them from passing through and reducing the strength of the field.

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