In the return stroke of a typical lightning bolt, a current of 2.5 104 a exists for 20 ms. how much charge is transferred in this event?

500 coloumb of charge is transferred in this event.

Explanation:

We are given:

According to mole concept:

1 mole of an atom contains number of particles.

We know that:

Charge on 1 electron =

Charge on 1 mole of electrons =

To calculate the charge transferred, we use the equation:

where,

I = current passed =

q = total charge = ?

t = time = 20 ms =0.02 s         (1 ms =0.001 s)

Putting values in above equation, we get:

Thus 500 coloumb of charge is transferred in this event.

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electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

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from wikipedia