1. (i) iron 1 for 1 mark (ii) 20 2 gains 2 marks else working gains 1
... use a coil with more turns or increase loops of wire or more coils use a stronger magnetic field or magnet or magnets closer together wind coil onto an iron core rotate coil faster reduce resistance of the coil or bulb or circuit or use thicker wire or increase ...
... use a coil with more turns or increase loops of wire or more coils use a stronger magnetic field or magnet or magnets closer together wind coil onto an iron core rotate coil faster reduce resistance of the coil or bulb or circuit or use thicker wire or increase ...
Electricity and Magnetism lecture 6
... voyages had to carry with them a piece of magnetite, or lodestone, to restore the magnetism of the compass needle. The soft iron then used for the needle could carry only a weak magnetism, which faded quite quickly. Lodestones were often mounted in brass, bronze or silver cases, and sometimes had an ...
... voyages had to carry with them a piece of magnetite, or lodestone, to restore the magnetism of the compass needle. The soft iron then used for the needle could carry only a weak magnetism, which faded quite quickly. Lodestones were often mounted in brass, bronze or silver cases, and sometimes had an ...
12-6
... magnetism from Iron. In 1821, a Danish physicist, Oersted noticed that an electrical wire carrying current made the near-by compass reorient. First clue of inter-relation between electricity and Magnetism. Ampere, Faraday established the nature of electricity and magnetism (all from their experime ...
... magnetism from Iron. In 1821, a Danish physicist, Oersted noticed that an electrical wire carrying current made the near-by compass reorient. First clue of inter-relation between electricity and Magnetism. Ampere, Faraday established the nature of electricity and magnetism (all from their experime ...
Magnetic Fields Inquiry Teacher`s Notes
... that the needle points in a direction which is perpendicular to the northsouth axis of the magnet. For example, if the compass normally points from S to N, place a magnet in an E-W orientation. The original orientation of the compass needle is due to the Earth’s magnetic field. We want the field due ...
... that the needle points in a direction which is perpendicular to the northsouth axis of the magnet. For example, if the compass normally points from S to N, place a magnet in an E-W orientation. The original orientation of the compass needle is due to the Earth’s magnetic field. We want the field due ...
phys1444-spring06-032006
... • In 1820, Oersted found that when a compass needle is placed near an electric wire, the needle deflects as soon as the wire is connected to a battery and the current flows – Electric current produces a magnetic field • The first indication that electricity and magnetism are the same thing ...
... • In 1820, Oersted found that when a compass needle is placed near an electric wire, the needle deflects as soon as the wire is connected to a battery and the current flows – Electric current produces a magnetic field • The first indication that electricity and magnetism are the same thing ...
Electromagnetic cannon
... discharging process of the capacitor, and the position of the ball. The dipole moment is associated with the changing rate of the magnetic field, and the magnetization of the ball. ...
... discharging process of the capacitor, and the position of the ball. The dipole moment is associated with the changing rate of the magnetic field, and the magnetization of the ball. ...
Magnetic Field
... The integral of the current density over a surface defines electric current, which is a scalar. ...
... The integral of the current density over a surface defines electric current, which is a scalar. ...
physics 172 wq 2010
... electric field is uniform along this path and is parallel to the path. We then use Eq. 29-8 to calculate the electric field at each point on this path. From the electric field we calculate the force on the charged particle. d 2 dB E d l E 2 r dt B r dt r dB 0.10 m F QE Q ...
... electric field is uniform along this path and is parallel to the path. We then use Eq. 29-8 to calculate the electric field at each point on this path. From the electric field we calculate the force on the charged particle. d 2 dB E d l E 2 r dt B r dt r dB 0.10 m F QE Q ...
Inductors in Alternating Current Circuits
... In 1830, Michel Faraday in England and Joseph Henry in the USA independently discovered that in a changing magnetic field, a changing magnetic flux through a surface bounded by a stationary loop of wire induces a current in the wire: emf induced and induced current. This process is known as inductio ...
... In 1830, Michel Faraday in England and Joseph Henry in the USA independently discovered that in a changing magnetic field, a changing magnetic flux through a surface bounded by a stationary loop of wire induces a current in the wire: emf induced and induced current. This process is known as inductio ...
The future of Geomagnetic Earth Observations
... No other measurable physical parameter can be used to sense so many diverse regions of the solid Earth ...
... No other measurable physical parameter can be used to sense so many diverse regions of the solid Earth ...
Magnetic Fields
... Q28) The diagram shows a straight wire carrying a flow of electrons into the page. The wire is between the poles of a permanent magnet. The direction of the magnetic force exerted on the wire is: 1) right 2) left 3) up 4) down 5) into the page Q29) The figure below shows four views of a horseshoe ma ...
... Q28) The diagram shows a straight wire carrying a flow of electrons into the page. The wire is between the poles of a permanent magnet. The direction of the magnetic force exerted on the wire is: 1) right 2) left 3) up 4) down 5) into the page Q29) The figure below shows four views of a horseshoe ma ...
22-Electromagnetic-Induction
... In the 1830’s Faraday and Henry independently discovered that an electric current could be produced by moving a magnet through a coil of wire, or, equivalently, by moving a wire through a magnetic field. Generating a current this way is called electromagnetic induction. If we move a rod perpendicula ...
... In the 1830’s Faraday and Henry independently discovered that an electric current could be produced by moving a magnet through a coil of wire, or, equivalently, by moving a wire through a magnetic field. Generating a current this way is called electromagnetic induction. If we move a rod perpendicula ...
act23
... varies as you move away from the magnet along each of its axes. While thinking about this measurement you wonder if a bar magnet’s magnetic field might be the result of the sum of the magnetic field of each pole. Although, to date, no isolated magnetic monopoles have ever been discovered, you wonder ...
... varies as you move away from the magnet along each of its axes. While thinking about this measurement you wonder if a bar magnet’s magnetic field might be the result of the sum of the magnetic field of each pole. Although, to date, no isolated magnetic monopoles have ever been discovered, you wonder ...
Electromagnet
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. The magnetic field disappears when the current is turned off. Electromagnets usually consist of a large number of closely spaced turns of wire that create the magnetic field. The wire turns are often wound around a magnetic core made from a ferromagnetic or ferrimagnetic material such as iron; the magnetic core concentrates the magnetic flux and makes a more powerful 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.Electromagnets are widely used as components of other electrical devices, such as motors, generators, relays, loudspeakers, hard disks, MRI machines, scientific instruments, and magnetic separation equipment. Electromagnets are also employed in industry for picking up and moving heavy iron objects such as scrap iron and steel.