$CATEGORY: Science - Khan Academy/13.Magnetic Effect of electric current/13.Magnetic Effect of electric current--Magnetic field due to current carrying Conductor

//Multiple Choice

A solenoid is a coil of wire that acts like a magnet when... {
    =Current flows through it
    ~Current does not flow through it
    ~Placed in a magnetic field
    ~None of the above
}

The magnetic field inside a solenoid is\: {
    ~Zero
    ~Non-uniform
    =Uniform and parallel to its axis
    ~Circular
}

The strength of the magnetic field inside a solenoid increases when\: {
    ~The number of turns is decreased
    =The current is increased
    ~The length of the solenoid is increased
    ~The diameter of the solenoid is increased
}

What happens when a soft iron core is inserted inside a solenoid? {
    ~The magnetic field decreases
    ~The magnetic field remains the same
    =The magnetic field increases
    ~The solenoid stops working
}

The magnetic field lines inside a solenoid are\: {
    ~Curved
    =Parallel
    ~Circular
    ~Radial
}

//True or False

The magnetic field inside a solenoid is zero. {F}

The magnetic field strength in a solenoid is proportional to the current flowing through it. {T}

A solenoid with a soft iron core produces a weaker magnetic field than one without. {F}

The magnetic field outside a solenoid is strong and uniform. {F}

The polarity of a solenoid can be reversed by reversing the direction of current flow. {T}

//Fill in the blanks



//Numericals



//Match the following

Match the following items from Column A with their correct corresponding options from Column B\:
{
=Solenoid -> Behaves like a bar magnet
=Magnetic field inside a solenoid -> Parallel and uniform
=Magnetic field outside a solenoid -> Weak and non-uniform
=Soft iron core inside a solenoid -> Strengthens the magnetic field
=Direction of magnetic field -> Can be reversed by changing the current direction
}


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