What force do the arrows represent?

  • Thread starter lioric
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  • #1
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1. Homework Statement
IMG_0599.JPG


Homework Equations


No equation
Theory
Right hand grip rule

The Attempt at a Solution


The correct answer is North Pole which is A
But I'm not following how it represents a North Pole.
Could you explain this for me?
 

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  • #2
scottdave
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Take a bar magnet. Magnetic lines of force come out of the North Pole of the magnet, then go around and back into South Pole. Think about how field lines interact. If the wire does not move, how would a magnet react to these field lines? Which way would a North end move? How about a South end?
 
  • #3
kuruman
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Imagine a magnetic compass needle initially aligned in the radial direction. It will experience a torque and line up with the local field line.
Q1: Is the south-north direction the same or opposite to the local field line?
Q2: What kind of force must act on the north pole so that the needle achieves this orientation?

On edit: @scottdave beat me to it by essentially asking the same questions.
 
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  • #4
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If you place a small bar magnet at each position on the field lines, the north pole will experience a force which will turn it along the direction of the arrows.

North pole - will point along the arrows
South pole - will point opposite to the arrows.

Hence your answer is North pole.
 
  • #5
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If you place a small bar magnet at each position on the field lines, the north pole will experience a force which will turn it along the direction of the arrows.

North pole - will point along the arrows
South pole - will point opposite to the arrows.

Hence your answer is North pole.
So the question is actually asking how the field lines align with a magnet.
Therefore North
Okey
Thank you very much guys
 

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