Magnetism and the Effect on a Freely Hung Loop

In summary, as the bar magnet PQ approaches the loop X, the loop will be repelled to the left regardless of whether P is a N-pole or a S-pole. This is because the induced current in the loop will be in the direction to oppose the motion, leading to an increase in its area. This can be understood by considering the behavior of two current-carrying wires next to each other, which attract when the current flows in the same direction and repel when the current flows in opposite directions. Therefore, the loop will experience an increase in area as it is pushed outward by the repelling force of the approaching magnet.
  • #1
april_angela
7
0
Fig.35 shows a light and flexible conducting loop X freely hung on a smooth horizontal rail. A
bar magnet PQ approaches the loop from the right. Which one of the following descriptions
about this process is correct?



A If P is a N-pole, the loop will be repelled to the left and its area will increase slightly.
B If P is a S-pole, the loop will be attracted to the right and its area will decrease slightly.
C No matter whether P is a N-pole or a S-pole, the loop will be repelled to the left and its area
will increase slightly.
D No matter whether P is a N-pole or a S-pole, the loop will be repelled to the left and its area
will decrease slightly.

can anyone help me with this qns? I've attached the diagram alrdy. I am not sure if the area will increase or decrease. and why?
 

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  • #2


Hint: If you have two current-carrying wires next to each other, do they attract or repel? Under what conditions?
 
  • #3


attract when the current flowing in the same direction;vice versa?
 
  • #4


april_angela said:
attract when the current flowing in the same direction;vice versa?
Good. So how does that relate to this problem?
 
  • #5


if the current repels the area increase? current attract area decrease? but idk how to relate to tis qns
 
  • #6


Consider the induced current in the loop as the magnetic flux through the loop changes.
 
  • #7


the induced current will be in the direction to oppose the motion. - repel the approaching magnet. means area increase?
 
  • #8


april_angela said:
the induced current will be in the direction to oppose the motion. - repel the approaching magnet.
Good.
means area increase?
Yes, but why? (Not for the reason above.)
 
  • #9


if it repels the magnet. the area of the loop will widen and increase as if they are like straight conductors
 

1. What is magnetism?

Magnetism is a fundamental force of nature that results from the movement of electric charges. It can attract or repel certain materials, depending on their magnetic properties.

2. How does magnetism affect a freely hung loop?

When a loop of wire is freely hung, it becomes a temporary magnet when exposed to a magnetic field. This is because the electrons in the wire align with the magnetic field lines, creating a magnetic force that causes the loop to move.

3. What factors affect the strength of magnetism on a freely hung loop?

The strength of magnetism on a freely hung loop is affected by the strength of the magnetic field, the material of the loop, and the size and shape of the loop. The closer the loop is to the source of the magnetic field, the stronger the magnetism will be.

4. How does the direction of the magnetic field affect a freely hung loop?

The direction of the magnetic field can determine the direction in which the freely hung loop will move. If the magnetic field lines are parallel to the loop, there will be no movement. However, if the field lines are perpendicular to the loop, the loop will experience the maximum force and will rotate to align with the magnetic field.

5. Can the strength of magnetism on a freely hung loop be changed?

Yes, the strength of magnetism on a freely hung loop can be changed by altering the magnetic field or by changing the material, size, or shape of the loop. Additionally, the number of loops in the wire can affect the strength of magnetism, as well as the direction in which the loop is facing in relation to the magnetic field.

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