Tag: lightning conductors

Questions Related to lightning conductors

State whether true or false:
Lightning conductors are used to save the building from earthquakes.

physics some natural phenomena lightning conductors lightning safety advanced of lightning

  1. True

  2. False

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Correct Option: B
Explanation:

The given statement is false. This is because a lightening conductor is a metal rod mounted on buildings intended to protect the structure from the 'Lightening strike' and not from 'earthquakes'.

Which one of the following statements is CORRECT?

    physics some natural phenomena lightning conductors lightning safety advanced of lightning

    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

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    Correct Option: D
    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).

    The lightening conductor is connected to interface with ground or "earth" through

    physics some natural phenomena lightning conductors lightning safety advanced of lightning

    1. a cathode

    2. an anode

    3. an electrode

    4. a semiconductor

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    Correct Option: C
    Explanation:

    Conductor cables carry lightening current from lightening rod to the ground. Since electrode is an electrical conductor. So, the answer is "an electrode".

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

    physics some natural phenomena lightning conductors lightning safety advanced of lightning

    1. A lightning conductor

    2. Copper wire

    3. A lightening shield

    4. All of the above

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    Correct Option: A
    Explanation:

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

    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

    physics some natural phenomena lightning conductors lightning safety advanced of lightning

    1. 10 C

    2. 20 C

    3. 30 C

    4. 40 C

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    Correct Option: C
    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.

    Where is the lower end of a lightning conductor fixed in the building?

    physics some natural phenomena lightning conductors lightning safety advanced of lightning

    1. at the top

    2. at a window

    3. at the base

    4. in the ground

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    Correct Option: A
    Explanation:

    a) It made from metal like Iron.
    b) Its top end is pointed.
    c) Obviously on the top of building far from any other metal.
    d) It is placed below the ground with a copper plate.