Define any three laws related to electromagnetic induction. Write use of each law.
Ans: Faraday’s laws of electromagnetic induction:
First law: Whenever a conductor cuts the magnetic flux, an emf is induced in it. OR Whenever a changing magnetic flux links with the conductor, an emf is induced in the conductor.
Use: Generator principle, Alternator principle.
Second law: The magnitude of induced EMF in the conductor is directly proportional to rate of change of flux linkages.
Use: To find magnitude of induced emf in Generator, To find magnitude of induced emf in Alternator
Fleming’s Right Hand Rule: Stretch out the first three fingers of your right hand such that they are mutually perpendicular to each other, align first finger in direction of magnetic field, thumb in direction of motion of conductor with respect to magnetic field, then the middle finger will give the direction of induced emf in conductor.
Use: Fleming’s right hand rule is used for finding the direction of dynamically induced emf.
Lenz`s Law: It states that the direction of an induced emf is such that it always opposes the cause that produces it.
Use: Lenz’s law used for finding the direction of statically induced emf.
Fleming's Left Hand Rule: Stretch out the first three fingers of your left hand such that they are mutually perpendicular to each other, align first finger in direction of magnetic field, middle finger in direction of current then the thumb will give the direction of force acting on conductor.
Use: Fleming’s left hand rule is used for finding the direction of force acting on current carrying conductor when placed in magnetic field.