Magnets are polarized, which means that each magnet has two opposite ends. The end of a magnet pointing to Earth`s geographic north pole is called the magnet`s north pole, while the opposite end is called the magnet`s south pole for obvious reasons. Each magnet has both a north pole and a south pole. There are no isolated magnetic poles or monopolies. If you divide a magnet into two halves, each half of the original magnet has both a north pole and a south pole, giving you two magnets. Physicists continue to search both physically and theoretically, but to date, no one has ever observed a North Pole without a South Pole or a South Pole without a North Pole. Question: A student is given two pieces of iron and asked to determine if one or both parts are magnets. First, the student touches one end of a room at one end of the other. The two pieces of iron attract each other. Then the student reverses one of the parts and touches the ends together again. Both pieces dress up again. What does the student definitively know about the initial magnetic properties of the two pieces of iron? Magnetic field lines are the lines drawn in a magnetic field along which a magnetic north pole would move. Magnetic field lines are also known as magnetic lines of force.

Activity to draw a magnetic field line on the outside of a bar magnet from one pole to another: Take a small compass and a bar magnet. With a little adhesive material, place the magnet on a sheet of white paper attached to a drawing board. Mark the boundary of the magnet. Place the compass near the north pole of the magnet. The south pole of the needle points to the north pole of the magnet. The north pole of the compass is oriented away from the north pole of the magnet. Mark the position of both ends of the needle. Now move the needle to a new position so that its South Pole occupies the position previously occupied by its North Pole. Proceed step by step in this way until you reach the south pole of the magnet. Connect the marked points on the paper with a smooth curve. This curve represents a magnetic field line. a) When the magnetic north pole moves, the magnetic field lines move.

Magnetic field lines are also known as magnetic lines of force. Magnetism is closely related to electricity. Essentially, magnetism is a force caused by moving charges. In the case of permanent magnets, moving charges are the orbits of electrons that revolve around the nuclei. Basically, strong permanent magnets have many atoms with electrons rotating in the same direction. Nonmagnets have more random arrays of electrons that revolve around the nucleus. In the case of electromagnets, the current itself provides the moving charges. In any case, magnetic fields can be used to describe the forces caused by magnets.

Answer: (B) has the highest magnetic field strength because it is located at the highest density of magnetic field lines. a) Define magnetic field lines. Describe an activity to draw a magnetically filed line outside a bar magnet from one pole to another. Answer: (3) An electric field is present due to the electric charge, and a magnetic field is present because the charge is in motion. Question: Draw at least four field lines to indicate the size and direction of the magnetic field in the region around a magnetic bar. a) The magnetic field lines leave the……… Pole of a bar magnet and enter to sound……. Pol.

Question: When two annular magnets are placed on a pencil, magnet A remains suspended above magnet B, as shown on the right. What statement describes the gravitational force and magnetic force acting on magnet A due to magnet B? The magnetic field lines of a bar magnet can be mapped with a magnetic compass. The compass can be moved from one pole of the bar magnet to another pole. We can follow the field lines by gradually moving the compass and drawing a corresponding line that the compass would follow when it follows a certain line of force. In this activity, we get a magnetic field pattern around the magnet. This also allows us to see the magnetic field lines that leave the magnet`s north pole and enter its south pole. Magnetic field lines: The magnetic field is the space around a magnet in which magnetic force can be felt. When an electric current passes through a wire, a magnetic field is generated around it.

Why, then, doesn`t an iron electrical connection cable attract nearby iron objects when the electric current is turned on by it? They used electric field lines to visualize what would happen with a positive charge in an electric field. To visualize a magnetic field, you can draw magnetic field lines (also called magnetic flux lines) that indicate the direction in which the north pole of a magnet would point if it were placed in the field. Magnetic field lines are drawn in the form of closed loops, from the north pole of a magnet to the south pole of a magnet. Inside the magnet itself, the field lines run from the South Pole to the North Pole. The magnetic field is strongest in areas with the highest density of magnetic field lines or areas with the highest magnetic flux density. The strength of the magnetic field (B) is measured in units known as Tesla (T). b) The Earth`s magnetic field is more similar to that of a …….. Magnet with its …….. Pol in the Northern Hemisphere. Answer: (1) Gravity can only attract, and since magnet A hovers over magnet B, the magnetic force must be repulsive. Explain why two magnetic field lines do not intersect. Which statement best describes the forces between the magnets in the bar? Question: The following diagram shows the magnetic lines of force between two magnetic north poles.

When is the strength of the magnetic field greatest? If you`re behind a web filter, make sure the *.kastatic.org and *.kasandbox.org domains are unlocked. Similar to electric charges, both poles and poles exert a repulsive force on each other, while opposite poles exert a force of attraction on each other. Materials can be classified as magnets, magnetotractable (materials that are not magnets themselves but can be attracted to magnets) and not attractive. A plot compass near the south pole of a bar magnet. The plot compass pointer becomes: The axis of the imaginary magnet of the earth and the geographical axis coincide. Khan Academy is a 501(c)(3) non-profit organization. Donate or volunteer today! Indicate whether the following statement is true or false: Attach the magnet from the bar to the drawing board with adhesive. Our mission is to provide free, world-class education to everyone, everywhere. ICSE Biology 10ICSE Chem 9UP Bio 11CBSE Physics 12UP Mathematics 12 ICSE Mathematics 10 MATHEMATICS ICSE 11CBSE Mathematics 11CBSE Physics 11CBSE Mathematics 10All PYQs To log in and use all the functions of Khan Academy, please enable JavaScript in your browser. The compass must be located near the north pole of the magnet.

The south pole of the needle points to the north pole of the magnet. Answer: At least one of the pieces of iron is a magnet, but we cannot say for sure that both are magnets. If you see this message, it means that we are having trouble uploading external resources to our website. b) Explain why a suspended magnet always points in a north-south direction. A movement of the needle shows that the South Pole occupies the North Pole. b) A free floating magnet points in a north-south direction because the Earth is a magnet with its south pole to the north and its north pole to the south. Answer: (3) Gravity always attracts and the North Poles repel each other. CBSE Mathematics 12ICSE Mathematics 12ICSE Physics 11MH 12 ChemistryICSE 10 PhysicsICSE Biology 12ICSE Mathematics 10CBSE Chem 11CBSE Mathematics 10CBSE Mathematics 11All programs.