Magnetic Force

Right Hand Rule #1

Right Hand Rule #2

• Magnetic Field is the distribution of a magnetic force in the region of a magnet There are two different magnetic characteristics, labelled North and South.
• Similar magnetic poles, north and north or south and south, repel one another. Dissimilar poles, north and south, attract one another with a force at a distance.
• Metals such as iron, nickel, and cobalt, or mixtures of there metals, are called the ferromagnetic metals, which means they could be attracted by magnets.
• Magnets are made of ferromagnetic metals
• Domain Theory states that all large magnets are made up of many smaller and rotatable magnets, called dipoles, which can interact with other dipoles close by. If dipoles line up, then a small magnetic domain is produced.
• Domains that line up could make the metal be magnetized.
• Oersted's Principle: Charge moving through a conductor produces a circular magnetic field around the conductor.
• Right-hand rules are three rule about magnets fields that involves your right hand. The abbreviation for them are RHR#1, RHR#2, and RHR#3.
• Right-hand rule#1: For conventional current flow, grasp the conductor with the thumb of the right hand pointing in the direction of conventional, or positive (+) current flow. The curved fingers point in the direction of the magnetic field around the conductor. There is a Left-hand rule#1, which is just opposite to RHR#1
• Scientists curve the conductor to strengthen the magnetic field.
• RHR#2: For conventional current flow, grasp the coiled conductor with the right hand such that curved fingers point in the direction of conventional, or positive (+), current flow. The thumb points tin the direction of the magnetic field within the coil. Outside the coil, the thumb represents the north end of the electromagnet produced by the coil.
• Left-hand rule#2: Opposite to RHR#2, the left-hand thumb grasp the coiled conductor, pointing the direction of the electron (-) current flow through the conductor.
• Electromagnet is a coil of wire around a soft iron core, which uses electric current to produce a magnetic field.
• Important formulas in the chapter are B2 = B1(I2/I1), and B2 = B1(n2/n1) - both of them are for calculating the strength of an electromagnet (B).