Tag: lightning conductors

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Questions Related to lightning conductors

Multiple choice physics some natural phenomena lightning conductors lightning safety advanced of lightning

Which one of the following statements is CORRECT?

    1. Lightning rods are made of insulators

    2. A conductor holds charge

    3. The earth is an insulator

    4. An insulator prevents charge from flowing
    Reveal answer Fill a bubble to check yourself
    D Correct answer
    Explanation

    An insulator does not allow the electric current to flow through it. Insulator offers very high resistance to the flow of electric current (charge).

    Multiple choice physics some natural phenomena lightning conductors lightning safety advanced of lightning

                          is engineered to protect an elevated structure in the event of lightning strike.

    1. A lightning conductor

    2. Copper wire

    3. A lightening shield

    4. All of the above
    Reveal answer Fill a bubble to check yourself
    A Correct answer
    Explanation

    A lightening conductor is a metal rod mounted on a structure and designed to protect the structure from lightening strike. 

    Multiple choice physics some natural phenomena lightning conductors lightning safety advanced of lightning

    If the instantaneous current in a metallic wire is $i = \left( {5 + 10t} \right)A$ then find amount of charge flown through it from $t = 2s$ to $t = 3s$ is

    1. 10 C

    2. 20 C

    3. 30 C

    4. 40 C
    Reveal answer Fill a bubble to check yourself
    C Correct answer
    Explanation

    Given instantaneous current,

    $i=(5+10t)A$
    and from the definition of instantaneous current,  $i=\dfrac { dq }{ dt } $
    $\Rightarrow \quad \left( 5+10t \right) =\dfrac { dq }{ dt } $
    $dq=\left( 5+10t \right) dt$
    Integrating implies,
    $Q=5t+{ 5t }^{ 2 }$
    At $t=2$,
                    ${ Q } _{ 1 }=30C$
    At $t=3$,
                    ${ Q } _{ 2 }=60C$

    $\therefore $  Option (C) is the correct option.