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level: Level 1

Questions and Answers List

level questions: Level 1

QuestionAnswer
magnetic flux formulamagnetic flux = B.A
unit for magnetic fluxweber (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 currentas 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 energythe 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 formulaL= mu(r).muo.n^2 AL
unit of self inductancehenry
a metal plate is getting heated. it can be becausea 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 formulaM21=muo.n1.n2.pi.r1^2l
unit of mutual inductancehenry
faraday's law of EMIwhen a closed coil is placed in changing magnetic field then electric current is induced in the coil
formula for finding current in a magnetic feildI=Btw/R
if current is anticlockwise and clockwise explain the poles formednorth pole for anticlockwise and south pole for clockwise
magnetic flux for n turnsphi=nBA
faraday's law given bymicheal 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 directionopposite direction to the direction when magnet is brought closer
conclusion of faraday's experimentsan induced emf is induced in acoil when a magnetic flux through the coil changes with time
peak value of induced emfe0=NBAW, e depends on time
induced current in the loopi=e/R depends on time
induced chargeqi= -dQ/R does not depend on time