The magnetic field lines around an electrified wire form concentric circles around the wire. 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 pointing in the direction of the current.
What is the shape of the magnetic field around a wire?
When a current flows in a wire, it creates a circular magnetic field around the wire. This magnetic field can deflect the needle of a magnetic compass.
What are the lines around a magnetic field called?
Magnetic field lines are a visual tool used to represent magnetic fields. They describe the direction of the magnetic force on a north monopole at any given position. Because monopoles are not found to exist in nature, we also discuss alternate means to describe the field lines in the sections below.
Are magnetic field lines closed curves?
Magnetic field lines are closed curves as they propagate from the North pole outside the magnet’s body to the magnet’s body and from the south pole to the north pole inside the magnet’s body. Hence, the magnetic field lines are closed.
What is the shape of the field lines around the current carrying wire?
The Magnetic field lines around a straight conductor carrying current are concentric circles whose centres lie on the wire. The direction of magnetic field lines can be determined using Right-Hand Thumb Rule.
Why do wires have magnetic fields?
Magnetic field of a wire. Magnetic fields arise from charges , similarly to electric fields, but are different in that the charges must be moving. A long straight wire carrying a current is the simplest example of a moving charge that generates a magnetic field.
Where is the magnetic field strongest?
The strongest external magnetic fields are near the poles . A magnetic north pole will attract the south pole of another magnet, and repel a north pole. The magnetic field lines of a bar magnet can be traced out with the use of a compass.
What are the rules for drawing magnetic field lines?
The properties of magnetic field lines can be summarized by these rules: The direction of the magnetic field is tangent to the field line at any point in space. A small compass will point in the direction of the field line. The strength of the field is proportional to the closeness of the lines.
Can we see magnetic flux lines?
Solution: No, we cannot see magnetic flux lines as the “lines of magnetic flux” is purely an imaginary concept to understand the magnetic field clearly.
How magnetic field is created?
Magnetic fields are produced by moving electric charges . Everything is made up of atoms, and each atom has a nucleus made of neutrons and protons with electrons that orbit around the nucleus. Since the orbiting electrons ≠are tiny moving charges, a small magnetic field is created around each atom.
Why does the magnetic field lines are closed curves?
Magnetic field lines are closed curve because magnetic monopoles do not exit . Outside a magnet direction of magnetic field, lines are from north to the South Pole and inside a magnet the direction if from south to north, hence forming a closed loop.
Why are electric field lines not closed curves?
If the electric field lines form a closed loop, these lines must originate and terminate on the same charge which is not possible because electric field lines always move from positive to negative . ... Therefore, we say electrostatic field lines never form closed loops.
Can field lines cross each other?
Electric field lines cannot cross . ... This is because they are, by definition, a line of constant potential. The equipotential at a given point in space can only have a single value. If lines for two different values of the potential were to cross, then they would no longer represent equipotential lines.
Why is there a magnetic field even when there is no current gizmos?
The magnetic field disappears when the current is turned off . ... Ferromagnetic materials retain an imposed magnetic field, so for these electromagnets there will be a remainder field even if the power is turned off.
What is L in magnetic field?
Magnetic Force on a Current
I is current of the current – measured in amperes (A). L is the length of conductor in the magnetic field – measured in meters (m) θ is the angle the current makes with the magnetic field – measured in either radians or degrees (° or C )
Why the direction of magnetic field is from north to south?
When it comes to magnets, opposites attract . This fact means that the north end of a magnet in a compass is attracted to the south magnetic pole, which lies close to the geographic north pole. ... The geographic north and south poles indicate the points where the earth’s rotation axis intercepts earth’s surface.
