Magnetism (determining the magnetic field)

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SUMMARY

This discussion focuses on determining the direction of the magnetic field created by a long straight wire carrying current. The wire is aligned north-south with current flowing north, resulting in a magnetic field direction of east directly above the wire. The right-hand rule is essential for understanding the magnetic field's orientation, particularly when determining the magnetic force on a proton traveling north above the wire. Clarification on spatial terminology, such as "above" and "to the left," is crucial for accurate problem-solving in electromagnetism.

PREREQUISITES
  • Understanding of the right-hand rule in electromagnetism
  • Basic knowledge of magnetic fields and forces
  • Familiarity with coordinate systems in physics
  • Concept of current direction in wires
NEXT STEPS
  • Study the right-hand rule in detail for magnetic field direction determination
  • Explore the Biot-Savart Law for calculating magnetic fields from current-carrying wires
  • Learn about Lorentz force and its application to charged particles in magnetic fields
  • Review coordinate systems and their application in physics problems
USEFUL FOR

Students of physics, educators teaching electromagnetism, and anyone seeking to understand the principles of magnetic fields and forces related to current-carrying conductors.

jojo14
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I just need help on how to solve these problems. I am so confused with the directions that i just don't get it...

1) A long straight wire is aligned north-south and carries current in the northerly direction. What is the direction of the magnetic field created directly abvove the wire?
Answer: East

2) What is the direction of the magnetic field created immediately to the left of the wire?
a. Downward
b. south
c. east
d. west
e. upward
f. north

3) If a proton is traveling north directly above the wire, what is the direction of the magnetic force on the proton due to the wire?
a. upward
b. south
c. downward
d. north
e. west
f. east

I just need an explanation on why, and how to do this? I know it's the right hand rule, but i dont' get the questions that are asking the placement, for example number 2 says to the left of the wire? what does that mean? and like number 1 says above the wire? what does that mean?
how do i go about this?

any help is greatly appreciated. thanks!
 
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Just draw the wire and set up a coordinate system. You know the wire goes N and S so you can label that. From those you can label E and W as well. Then "above the wire" is just above the plane of the wire or above sheet of paper.
 

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