Since compasses work by pointing along magnetic field lines, this means that there must be a magnetic field near the wire through which the current is flowing. The magnetic field produced by an electric current is always oriented perpendicular to the direction of the current flow.
What is the direction of the magnetic field surrounding a current carrying wire?
Magnetic Field of Current
The direction of the magnetic field is perpendicular to the wire and is in the direction the fingers of your right hand would curl if you wrapped them around the wire with your thumb in the direction of the current.
Why does a compass needle move when it is near a wire with an electric current?
Every electric current produces magnetism. … Since the compass needle is also a magnet, the magnetic field around the wire attracted and repelled the ends of the compass magnet and caused it to move. You have seen that electricity flowing through a wire can cause a magnet to move. This is called the motor effect.
How do you determine the direction of a magnetic force?
The right hand rule states that, to find the direction of the magnetic force on a positive moving charge, the thumb of the right hand point in the direction of v, the fingers in the direction of B, and the force (F) is directed perpendicular to the right hand palm.
What happens if you put a compass near an electrical current?
If you hold a compass near a wire through which current is flowing, the needle on the compass will be deflected. Since compasses work by pointing along magnetic field lines, this means that there must be a magnetic field near the wire through which the current is flowing.
What happens to the compass when you move it to a different position around the wire?
When you move the compass away from the wire, the needle returns towards it original position (pointing towards magnetic north). … So the magnetic field direction is different above and below the wire. This happens because there is actually a magnetic field created which goes around the wire.
When we bring a magnetic compass needle near an electric current carrying wire?
When a magnetic compass is brought near a current carrying conductor the needle gets deflected because of the magnetic field produced by the current carryung conductor. It is so because a current carrying wire act as a magnet and we all know that the compaas get deflected if we bring a magnet near it.
Why does my compass point south?
Reverse polarity is where the magnetism in the compass needle becomes permanently reversed so the red end of the needle points south instead of north. This is different to the magnetic needle being temporarily deviated a little when near a metal object or weak magnet and correcting itself as soon as it is moved away.
Why does a compass always point to the north direction?
Earth’s south magnetic pole is near Earth’s geographic north. Earth’s magnetic north pole is near Earth’s geographic south. That’s why the north pole of a compass points toward north because that’s where Earth’s south magnetic pole is located and they attract.
What does the needle of a compass point to?
A compass needle points north because the north pole of the magnet inside it is attracted to the south pole of Earth’s built-in magnet.
How do you know the direction of current in a wire?
Using the right hand rule for the conventional current in the wire, the right thumb is pointed along the wire pointing to the left. At point the fingers curl around and point up, out of the screen. This can be verified by putting the thumb in the direction of current anywhere in the circuit.
What is the direction of the force on the wire?
The magnetic field exerts a force on a current-carrying wire in a direction given by the right hand rule 1 (the same direction as that on the individual moving charges). This force can easily be large enough to move the wire, since typical currents consist of very large numbers of moving charges.