Electrodynamic Effect

Electrodynamic Effect Points : Electrodynamic Effect This effect is used in the electrodynamic or electrodynamometer type of instruments. This effect, which is basically a magnetic effect is produced in the form of force, when two current carrying coils are placed near each other. When one coil is fixed and other is movable, thus there is a force of fixed attraction and there will be a motion of the movable coil. Hall Effect If a strip of conducting material carries current in the presence of a transverse magnetic field, an emf is produced between two edges of conductor. The magnitude of the voltage depends upon the current flux density and a property of conductor called “Hall Effect Co-efficient”. The emf may be measured after amplification. The Hall Effect elements are extensively used in magnetic measurements. This can also be used for sensing of current. Another instrument, that uses Hall Effect is Pointing Vector Wattmeter. This wattmeter is used for measurement of the power loss density at the surface of a magnetic material.