The force with which two similar charges repel each other depends on the __________ charge they carry.

When lightning strikes, a ____________ wave get produced in the intervening air.

Give reasons:

When we take off woollen or synthetic clothes sometimes we hear a crackling sound.

It might be dangerous to raise an umbrella over our head in a thunder storm.

A car with closed windows is a safe place during lightning.

Ans.

Give the order of potential difference between the earth and a charged cloud during lighting.

it might be dangerous to raise an umbrella over our head during a thunderstrom because lightning is more likely to strike projecting and pointed objects than larger, flatter surfaces.if the lightning strikes at the pointed tip of the umbrella, the current will flow from the tip to the hande of umbrella and we could gget a shock.

The potential difference between a charged cloud and the earth is 100 million volts.

wool or synthetic fibres are  not conductive of electricity. Thus they are easily able to build up an electric charge when they are moved, and the small electrical discharges are what we hear. we hear them because some of the discharges are close to your ear.
A cotton tee shirt seldom produces the crackles.
And in winter, because the air is drier, and less conductive, hence allows these charges to build up.

blanks:-

a) electric

b)shock wave