OERSTED’S EXPERIMENT Topic covered Oersted’s experiment Maxwell’s right hand thumb rule Electromagnetism Equilibrium Description An experiment to demonstrate the electromagnetic field around a current carrying conductor. Objectives The following can be learned from the simulation Identify the relationship between electricity and magnetism Find how electromagnetism is used for maglev train Instructions A compass is placed over a current carrying conductor. Switch on the circuit and observe the electromagnetic field around the conductor. Click on the battery to change the polarity. Click on the next button to place the compass below the conductor. Observations What causes the compass to reflect when an electric current passes through the conductor? OERSTED’S EXPERIMENT What happens to the electromagnetic field when the direction of current changes? Why the deflection of compass is in opposite direction when the compass placed below the conductor? Today I have learned that: OERSTED’S EXPERIMENT Quiz Who first discovered the relationship between electricity and magnetism? Faraday Newton Oersted Maxwell An electric current passes through a straight wire in the direction of south to north. Magnetic compasses are placed at points A and B as shown in the figure. What is your observation? The needle will not deflect Only one of the needles will deflect Both the needles will deflect in the same direction The needles will deflect in the opposite directions The direction of induced current is obtained by Fleming's right-hand rule Maxwell's right-hand thumb rule Ampere's rule You have a coil and a bar magnet. You can produce an electric current by Moving the magnet but not the coil Moving the coil but not the magnet Moving either the magnet or the coil Using another DC source OERSTED’S EXPERIMENT Reference Hans Christian Oersted was a Danish physicist and chemist who discovered that electric currents create magnetic fields, which was the first connection found between electricity and magnetism. He is still known today for Oersted's Law. He shaped post-Kantian philosophyand advances in science throughout the late 19th century. In 1824, Oersted founded Selskabet for NaturlærensUdbredelse (SNU), a society to disseminate knowledge of the natural sciences. He was also the founder of predecessor organizations which eventually became the Danish Meteorological Institute and the Danish Patent and Trademark Office. Oersted was the first modern thinker to explicitly describe and name the thought experiment. A leader of the so-called Danish Golden Age, Oersted was a close friend of Hans Christian Andersen and the brother of politician and jurist Anders SandøeØrsted, who eventually served as Danish prime minister (1853–54). The oersted (Oe), the cgs unit of magnetic H-field strength, is named after him. On 21 April 1820, during a lecture, Oersted noticed a compass needle deflected from magnetic north when an electric current from a battery was switched on and off, confirming a direct relationship between electricity and magnetism. His initial interpretation was that magnetic effects radiate from all sides of a wire carrying an electric current, as do light and heat. Three months later he began more intensive investigations and soon thereafter published his findings, showing that an electric current produces a circular magnetic field as it flows through a wire. This discovery was not due to mere chance, since Oersted had been looking for a relation between electricity and magnetism for several years. The special symmetry of the phenomenon was possibly one of the difficulties that retarded the discovery. Sources and References https://en.wikipedia.org/wiki/Hans_Christian_%C3%98rsted https://en.wikipedia.org/wiki/Oersted%27s_law http://www.funscience.in/oersted_experiment.php .