Electromagnetic Induction Quiz

Experiments of Electromagnetic Induction and Their Applications

• Electromagnetic induction was a revolutionary invention that led to the discovery of electric lights, trains, telephones, and personal computers.
• Michael Faraday and Joseph Henry conducted experiments that led to the discovery of electromagnetic induction.
• The coil C1 connected to a galvanometer G experiment showed that the presence of electric current in the coil is indicated by the deflection of the pointer in the galvanometer when the North-pole of a bar magnet is pushed towards the coil.
• The deflection in the galvanometer is found to be larger when the magnet is pushed towards or pulled away from the coil faster.
• Faraday's Law of Induction states that the magnitude of the induced emf in a closed loop is equal to the time rate of change of magnetic flux through the loop.
• Lenz's Law is in accordance with the law of conservation of energy, as the induced current opposes the change in flux, work has to be done against the opposition offered by the induced current in changing the flux.
• An electric field is induced in any region of space in which a magnetic field is changing with time, and the induced electric field and magnetic field are at right angles to each other.
• Eddy currents are undesirable since they heat up the core and dissipate electrical energy in the form of heat. However, they are used to advantage in certain applications.
• Self-inductance is the property of a coil by which an induced emf is developed in itself due to a change in the strength of the current flowing through the coil itself.
• The energy stored in an inductor is in the form of a magnetic field, and it is given by W=1/2Li^2.
• Mutual induction is the phenomenon by which an induced emf is produced in one coil due to a change in the strength of the current flowing through another coil.
• An AC generator converts mechanical energy into electrical energy, and it consists of a coil mounted on a rotor shaft, which is mechanically rotated in the uniform magnetic field by some external means.