Magnet and Current-carrying wire/circuit

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In summary, the conversation discusses using the right hand rule to determine the direction a wire will move in relation to a magnet. It is also mentioned that the left hand rule is more appropriate for this situation. Additionally, there is a question about whether the wire returning from the resistor will be affected in the same direction and a question about whether two long wires will exert force on each other in the absence of a magnet.
  • #1
zebra1707
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Hi all Can you assist - I think that I am on the right track - but then I could be wrong..

View attachment Physics Question 1.doc

Homework Statement



Predict which direction the wire will move

Homework Equations



Right hand rule

The Attempt at a Solution



Current flows from positive to negative. Right hand rule has magnetic field - anticlockwise.
A northward force. The assumption is that the wire will move away from the magnet.


Two other related questions...

2. Would the wire returning from the resistor to the source be affected in the same direction and or as strongly. Explain?

I assume a southward field and therefore will be attracted to the magnet.

3. In the absence of the magnet, would the two long wires exert any force on each other? Explain.

No, force.



Cheers Petra
 
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  • #2
zebra1707 said:

Homework Equations



Right hand rule

To work out the direction the wire will move you will need to use Flemings left hand rule, the right hand rule is for generators =]
 
Last edited:
  • #3
HI Rory

Thanks for the reply. The question states (Remember the righthand rule).

RoryP said:
To work out the direction the wire will move you will need to use Flemings left hand rule, the right hand rule is for generators =]

Cheers Petra
 

FAQ: Magnet and Current-carrying wire/circuit

How does a current-carrying wire create a magnetic field?

When a current flows through a wire, it creates a circular magnetic field around the wire. This is due to the movement of electrons, which are negatively charged particles, causing a force that creates a magnetic field.

What is the relationship between the strength of a magnetic field and the amount of current in a wire?

The strength of a magnetic field created by a current-carrying wire is directly proportional to the amount of current flowing through the wire. This means that as the current increases, the strength of the magnetic field also increases.

Can a magnet affect the flow of current in a wire?

Yes, a magnet can affect the flow of current in a wire. When a wire is placed in a magnetic field, the magnetic force exerted on the electrons in the wire can cause a change in the direction of the current or even stop the flow of current altogether.

How does the direction of current affect the direction of the magnetic field?

The direction of the magnetic field created by a current-carrying wire is determined by the direction of the current. The right-hand rule can be used to determine the direction of the magnetic field, where the thumb points in the direction of the current and the curled fingers point in the direction of the magnetic field.

Can a current-carrying wire be used to create an electromagnet?

Yes, a current-carrying wire can be used to create an electromagnet. When a wire is wrapped around a metal core and a current is passed through it, it creates a stronger magnetic field than a single wire. This is because the magnetic field created by each loop of wire adds up, resulting in a stronger overall magnetic field.

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