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# electromagnetic induction

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sakhi rathore

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[Front]

magnetic flux formula
[Back]

magnetic flux = B.A

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### Questions:

22 questions
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 Magnetic flux formula Magnetic flux = B.A
 Unit for magnetic flux Weber (wb) and it is scalar
 A cylindrical bar magnet is rotated about its axis. a wire is connected from the axis and is made to touch the cylindrical surface through a contact. explain current As there is no change in magnetic flux associated with the circuit, no current is induced in the circuit. the ammeter A shows no deflection
 Lenz's law and conservation of energy The polarity of induced emf is such that it tends to produce a current which opposes the change in magnetic flux that produced it
 Self inductance formula L= mu(r).muo.n^2 AL
 Unit of self inductance Henry
 A metal plate is getting heated. it can be because A current( either A.C. or D.C) is passing through her. it is placed in a time varying magnetic field
 When bulk pieces of conductors are subjected to changing magnetic flux, induced currents are produced in them. however, their flow patterns resemble swirling eddies in water, discovered by foucault. Eddy currents
 Mutual inductance formula M21=muo.n1.n2.pi.r1^2l
 Unit of mutual inductance Henry
 Faraday's law of EMI When a closed coil is placed in changing magnetic field then electric current is induced in the coil
 Formula for finding current in a magnetic feild I=Btw/R
 If current is anticlockwise and clockwise explain the poles formed North pole for anticlockwise and south pole for clockwise
 Magnetic flux for n turns Phi=nBA
 Faraday's law given by Micheal faraday in england and josheph henry in USA around 1830
 When north pole of magnet is pulled away from the coil then the galvanometer shows deflection in which direction Opposite direction to the direction when magnet is brought closer
 Conclusion of faraday's experiments An induced emf is induced in acoil when a magnetic flux through the coil changes with time
 Peak value of induced emf E0=NBAW, e depends on time
 Induced current in the loop I=e/R depends on time
 Induced charge Qi= -dQ/R does not depend on time
 Induced EMF formula E= -dphi/dt
 Direction of induced current Always opposes the cause due to which it is produced