CONCEPTS HARD AND SOFT MAGNETIC MATERIALS: Materials‚ which are difficult to magnetise and de-magnetise. Soft materials are easy to magnetise and de-magnetise. MAGNETIC FIELD: The area around a magnet where another magnet would feel a force. MAGNETIC FIELD LINES: Show the direction of the magnetic field. The lines run from North to South. Where the field is strong‚ they are close together. INDUCED MAGNETISM: A magnetic material can be magnetised by being placed in a magnetic field. ELECTROMAGNET:
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caring conductor is placed in magnetic field then a force is generated on current caring conductor. F = BIL. Sinθ If all three B and L are Perpendicular to each other‚ then F = BIL If a conductor is moving in magnetic field then an EMF is generated in a conductor . E = BVL. Sinθ E = BVL If B is Perpendicular to V Basic Principles For magnetic field density (B): 1. Magnetic Fields: Direction of Field: North South 2. Electro Magnetic Fields: - Current caring conductor
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Saturable reactor or magnetic amplifier is a circuit that used to control very large load of AC with very small input DC. The saturable reactor consists of three essential elements : Direct current source‚ magnetic core with windings‚ and alternating current source. How it work? The AC load circuit run on to magnetic core and the DC control circuit is also went on to the same core. Ac current flows through winding and Since this current is alternating‚ the flux set up in the magnetic circuit loop is
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Week Five Textbook Exercises Geoffrey Anderson PHY/101 December 9‚ 2014 Mr. Craig Spencer Week Five Textbook Exercises Chapter 22: Electrostatics 8) When combing your hair‚ you scuff electrons from your hair onto the comb. Is your hair then positively or negatively charged? How about the comb? -The hair becomes positively charged and the comb becomes negatively charged; since‚ the electrons went from your hair to the comb and the more electrons there is makes an object more negative. 18)
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PDHPE STAGE 6 HSC COURSE HSC CORE ONE: HEALTH PRIORITIES IN AUSTRALIA HOW ARE PRIORITY ISSUES FOR AUSTRALIAS HEALTH IDENTIFIED? Health priority issues are those health issues that are greatest concern to governments and support organizations due to the effect they have on the overall health of Australians and the burden of health on the economy. * Measuring health status Health status is the pattern of health of the population in general over a period of time. We measure our health
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Circular motion‚ gravitational field‚ and oscillation 1.Define gravitational field strength: Force per unit mass 2. Explain why there is a point between two point masses at which the gravitational field strength is zero. Because gravitational fields of two masses are in opposite directions‚ so there is a point where it is zero What is meant by angular velocity The rate of change of the angular displacement of an object as it moves along curved path. Generally when asked to test
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Physics Exam Study Notes By: Faizan Dhalla | SPH3U 1: Forces and Motion * Kinematics: study of motion * Basic types of motion: * Uniform (constant speed in straight line) * Non-uniform * Scalar quantity: with magnitude & no direction * Distance‚ average speed * Vector quantity: with magnitude (arrow above it) & direction (in square brackets after unit) * Position‚ displacement‚ acceleration * Velocity: * Rate of change of position *
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INTRODUCTION If an electric current flows through a conductor in a magnetic field‚ the magnetic field exerts a transverse force on the moving charge carrier which tends to push them to one side of the conductor. A buildup of charge at the sides of the conductors will balance this magnetic influence‚ producing a measurable voltage between the two sides of the conductor. This presence of measurable transverse voltage is the Hall Effect. The Hall effect was discovered in 1879 by Edwin Herbert Hall
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We are going to make a circuit‚ including a coil around a core‚ and measure how the variables affect the number of paper clips picked up. These variables are length of wire‚ number of coils‚ and the strength of the current. Method: We are going to use a circuit that includes a 12v power pack on a d.c and a.c current‚ a variable resistor set at different currents‚ an ammeter‚ crocodile connecting clips‚ an iron core‚ a wire coil‚ paper clips and a light bulb which provides resistance
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help of magnetic fields. These conversion processes also result in losses to the machine. Types of Losses The losses in a three phase induction machine are broadly classified into the following types 1) Magnetic losses 2) Electrical Losses 3) Mechanical Losses Magnetic losses The presence of rotating magnetic field in the stator core results in the magnetic losses. Stator core is made up of silicon steel or iron stampings‚ these losses is also called as core losses. Eddy Current Loss The core material
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