$CATEGORY: Science - Khan Academy/13.Magnetic Effect of electric current/13.Magnetic Effect of electric current--Electromagnetic induction

//Multiple Choice

Electromagnetic induction is the process of\:
{
=Generating electric current from magnetic fields
~Generating electric current from mechanical energy
~Converting electrical energy into magnetic energy
~Converting mechanical energy into electrical energy
}

Faraday’s law of electromagnetic induction states that the induced emf is proportional to\:
{
=The rate of change of the magnetic flux
~The square of the magnetic field
~The magnitude of the current
~The direction of the current
}

Which of the following devices works on the principle of electromagnetic induction?
{
=Electric generator
~Electric motor
~Battery
~Ammeter
}

In Faraday's experiment, the induced current was observed when\:
{
=There was relative motion between the magnet and the coil
~The magnet was stationary
~The coil was stationary
~The circuit was open
}

Electromagnetic induction occurs when\:
{
=Both b and c
~An electric current is applied to a magnet
~A conductor is moved in a stationary magnetic field
~A magnet is moved inside a stationary conductor
}

The magnitude of the induced current depends on\:
{
=All of the above
~The strength of the magnetic field
~The speed of the motion between the coil and the magnet
~The number of turns in the coil
}

//True or False

Electromagnetic induction occurs only when a magnet is at rest inside a coil. {F}

Faraday's law relates the induced emf to the rate of change of magnetic flux. {T}

In Faraday's experiment, no current was induced when the magnet was stationary with respect to the coil. {T}

The electric motor works on the principle of electromagnetic induction. {F}

Electromagnetic induction occurs when there is relative motion between a conductor and a magnetic field. {T}

The magnitude of the induced current depends only on the strength of the magnetic field. {F}

In electromagnetic induction, no current is induced when the magnet is stationary relative to the coil. {T}

//Fill in the blanks



//Numericals



//Match the following

Match the following items from Column A with their correct corresponding options from Column B\:
{
= Electromagnetic Induction -> Generates emf due to magnetic field 
= Faraday's Law -> Rate of change of magnetic flux 
= Lenz’s Law -> Opposes the change in magnetic flux 
= Electric Generator -> Converts mechanical to electrical energy 
= Induced emf -> Depends on the motion of magnet and coil 
}


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