$CATEGORY: Science - Khan Academy/13.Magnetic Effect of electric current/13.Magnetic Effect of electric current--Electric generator

//Multiple Choice

Fleming’s Right-Hand Rule is used to determine the direction of\: {
    ~Electric current
    ~Magnetic field
    =Induced current
    ~Force on a conductor
}

In Fleming’s Right-Hand Rule, the thumb represents the direction of\: {
    ~Magnetic field
    =Motion of the conductor
    ~Induced current
    ~None of these
}

The index finger in Fleming’s Right-Hand Rule indicates the direction of\: {
    ~Electric current
    =Magnetic field
    ~Motion of the conductor
    ~None of these
}

The middle finger in Fleming’s Right-Hand Rule represents the direction of\: {
    ~Force
    ~Magnetic field
    =Induced current
    ~None of these
}

Fleming’s Right-Hand Rule is used for\: {
    ~Electric motors
    =Generators
    ~Transformers
    ~Electromagnets
}

If a conductor moves perpendicular to a magnetic field, what is induced? {
    ~Heat
    =Current
    ~Light
    ~Sound
}

Which device works on the principle of Fleming’s Right-Hand Rule? {
    ~Electric bell
    =Electric generator
    ~Electric motor
    ~Battery
}

When a conductor moves in a magnetic field, what type of current is induced? {
    ~Direct current
    =Alternating current
    ~Static electricity
    ~No current
}

What is necessary for electromagnetic induction? {
    ~A stationary conductor
    =A moving conductor in a magnetic field
    ~A rotating mirror
    ~A chemical reaction
}

In an AC generator, the current changes direction due to\: {
    ~Static electricity
    ~Change in magnetic poles
    ~Resistance of the conductor
    =Rotation of the coil
}


//True or False

Fleming’s Right-Hand Rule is used in motors. {F}

The thumb in Fleming’s Right-Hand Rule represents motion of the conductor. {T}

The middle finger in Fleming’s Right-Hand Rule shows the direction of the induced current. {T}

A generator converts electrical energy into mechanical energy. {F}

The induced current depends on the speed of motion of the conductor. {T}

If the conductor moves parallel to the magnetic field, no current is induced. {T}

The greater the speed of movement, the higher the induced voltage. {T}

Electromagnetic induction occurs even when there is no relative motion. {F}

The unit of magnetic field strength is Newton. {F}

Fleming’s Right-Hand Rule is a rule of electromagnetic induction. {T}

//Fill in the blanks

Fleming’s Right-Hand Rule is used to determine the direction of ______. {
    =induced current
    ~force
    ~heat
    ~None of the above
}

The thumb in Fleming’s Right-Hand Rule represents ______. {
    ~current
    ~magnetic field
    =motion of conductor
    ~None of the above
}

The index finger in Fleming’s Right-Hand Rule represents ______. {
    ~current
    =magnetic field
    ~resistance
    ~None of the above
}

The middle finger in Fleming’s Right-Hand Rule represents ______. {
    ~Force
    =induced current
    ~motion
    ~None of the above
}

A generator converts ______ energy into electrical energy. {
    =mechanical
    ~thermal
    ~light
    ~None of the above
}

The induced current is produced due to ______. {
    ~static electricity
    =electromagnetic induction
    ~conduction
    ~None of the above
}

The unit of magnetic field strength is ______. {
    =Tesla
    ~Newton
    ~Coulomb
}

If the motion of the conductor is reversed, the induced current will ______. {
    ~increase
    ~decrease
    =reverse direction
    ~None of the above
}

An electric generator works on the principle of ______. {
    =electromagnetic induction
    ~electrolysis
    ~thermoelectric effect
    ~None of the above
}

A device that converts mechanical energy into electrical energy is called a ______. {
    ~motor
    =generator
    ~resistor
    ~None of the above
}


//Numericals

A conductor of length 2 m moves perpendicular to a magnetic field of strength 0.5 T with a velocity of 3 m/s. What is the induced emf? {
    ~2 V
    ~3 V
    =1.5 V
    ~6 V
}

A wire of length 1.5 m is moving at 2 m/s in a magnetic field of 0.4 T. What is the induced emf? {
    =0.6 V
    ~1.2 V
    ~0.8 V
    ~0.4 V
}

A conductor moves in a magnetic field at a speed of 10 m/s, generating an induced voltage of 5 V. If the length of the conductor is 1 m, what is the strength of the magnetic field? {
    =0.5 T
    ~0.2 T
    ~1 T
    ~2 T
}

A loop moves in a magnetic field of 0.3 T with velocity 4 m/s. The length of the loop is 2 m. What is the induced emf? {
    ~1.2 V
    =2.4 V
    ~0.8 V
    ~1.5 V
}

A wire of length 1 m is moving at 5 m/s in a 0.2 T magnetic field. The induced emf is\: {
    =1 V
    ~2 V
    ~0.5 V
    ~0.1 V
}


//Match the following

Match the following items from Column A with their correct corresponding options from Column B\:
{
    =Fleming’s Right-Hand Rule -> used in generators
    =Thumb -> Motion of conductor
    =Index finger -> Magnetic field direction
    =Middle finger -> Induced current direction
}


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