The lines of magnetic field from a bar magnet form closed lines. By convention, the field direction is taken to be outward from the North pole and in to the South pole of the magnet.
What happens when a magnet is placed in a magnetic field?
For if a magnet is placed in a uniform magnetic field then both poles will feel the same magnetic force but in opposite directions, since they have opposite magnetic charge.
How do you determine the direction of a magnetic field?
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.
How does a bar magnet have a magnetic field?
Their movement generates an electric current and causes each electron to act like a microscopic magnet. … When you rub a piece of iron along a magnet, the north-seeking poles of the atoms in the iron line up in the same direction. The force generated by the aligned atoms creates a magnetic field.
How magnetic field is created?
Any current (movement of electrical charge) will create a magnetic field. Certain materials are capable of realigning the angular momentum of their electrons, and iron is one of them. When the angular momentum of electrons gets aligned, an external magnetic field is created.
Where on a magnet is the magnetic field strongest?
The magnetic field generated by any magnet is always strongest at either pole. The magnetic force is equally as strong at both the north and south pole.
How do you change the direction of a magnetic field?
One end of the magnet becomes a north pole and the other end becomes the south pole. When you reverse the direction of the current flowing in the wire, the north and south poles are also reversed. When you reverse the current again, the north and south poles reverse again.
Does magnetic field have direction?
The direction of the force due to a magnetic field is perpendicular to the direction of motion.
How do you use a compass to find the direction of a magnetic field?
Magnetic fields can be mapped out using small plotting compasses :
- place the plotting compass near the magnet on a piece of paper.
- mark the direction the compass needle points.
- move the plotting compass to many different positions in the magnetic field, marking the needle direction each time.
Where is the weakest area of magnetism on a magnet?
The magnetic field of a bar magnet is strongest at either pole of the magnet. It is equally strong at the north pole when compared with the south pole. The force is weaker in the middle of the magnet and halfway between the pole and the center.
Is electromagnet a permanent magnet?
The main advantage of an electromagnet over a permanent magnet is that the magnetic field can be quickly changed by controlling the amount of electric current in the winding. However, unlike a permanent magnet that needs no power, an electromagnet requires a continuous supply of current to maintain the magnetic field.
Which bar is magnetic?
Alnico and Neodymium Bar Magnet
The primary components of Alnico magnets are aluminium, nickel, cobalt, and iron.
Can we use the Earth’s magnetic field to generate electricity?
Earth’s magnetic field is very weak, so you would get very little current from your generator. … They have magnetic fields around 6,000 times stronger than Earth’s magnetic field. Magnetic fields inside electrical generators are similar to this.19 мая 2019 г.
Why is B used for magnetic field?
What is the historical reason for denoting magnetic filed “B”? … A is still used for vector potential, B for magnetic field (or magnetic induction or flux density, depending who you ask), H for magnetic intensity, etc. Maxwell used C and G for other vectors that I don’t recall at the moment.
What is the strongest magnetic material?