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Lightning Safety : Steps to Follow

Electrons in ...

Question

Electrons in the cloud induce positive charge in the ground.

A

True

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B

False

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Solution

The correct option is A True

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Q. During storms clouds get changed. The dielectric breakdown of air is

3 \times 10^{6}

V/m and there is a cloud of area

0.5 k m^{2}

which is 500 m above ground. This cloud induces an opposite charge on ground due to which this cloud-ground system behaves as a parallel plate capacitor.

Q. In charging by induction, if a neutral conducting sphere is brought near a positive source charge and then grounded after a while. After grounding the sphere, electrons will flow from

Q. The properties of most of the ionic solids deviate from their ideal ionic character because the lattice undergoes some distortion. Cations are usually smaller than anions and have a higher effective nuclear charge. The outer electron cloud in a cation is more firmly held than in an anion. The loose electron cloud of an anion, when attracted by the electron cloud of a cation, gets distorted. This phenomenon is known as polarization. Due to this phenomenon, the electron cloud of an anion shifts towards the cation which decreases both the magnitude of positive charge on the cation and the negative charge on the anion. In other words, covalent character develops in the ionic bond.

Which of the following is an ionic compound?

Q. A cloud is at a potential of

8 \times 10^{6}

volts relative to the ground. A charge of 80 coulombs is transferred in lighting stroke between the cloud and the ground. Assuming the potential of the cloud to remain constant the energy dissipated is _.

Q. The solid water (or hailstones) falling from the upper portion of the cloud carry electrons with them, leaving the upper portion positively charged.

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