Basic Science Solutions for Class 8 Science Chapter 10 Electricity And Lightning are provided here with simple step-by-step explanations. These solutions for Electricity And Lightning are extremely popular among Class 8 students for Science Electricity And Lightning Solutions come handy for quickly completing your homework and preparing for exams. All questions and answers from the Basic Science Book of Class 8 Science Chapter 10 are provided here for you for free. You will also love the ad-free experience on Meritnation’s Basic Science Solutions. All Basic Science Solutions for class Class 8 Science are prepared by experts and are 100% accurate.

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Both a plastic ruler and a woollen cloth will acquire opposite charges when they are rubbed vigorously.

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The glass rod will attract the cylinder because the glass rod will acquire a positive charge when it is rubbed with a piece of silk.

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The positively charged rod will attract the cylinder because the cylinder will have a negative charge.

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The distance between the leaves of the disc of the positively-charged electroscope will decrease.

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Charge from the negatively charged electroscope will flow through the human body.

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When a piece of Styrofoam is rubbed with a piece of paper, negative charge from the paper is transferred to the Styrofoam. Thus the piece of Styrofoam acquires a net negative charge. The paper, which loses negative charge, acquires a net positive charge.

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When a negatively charged rod is brought close to an uncharged paper cylinder, it attracts the cylinder because the cylinder has an equal number of positive and negative charges. When the negatively charged rod is brought close to it, the negative charge in the cylinder will move away from the rod, leaving only positive charge near the rod. This is why the cylinder moves towards the rod. When the rod touches the cylinder, some of the excess negative charge on the rod will be transferred to the cylinder (net negative charge) and the cylinder will get repelled by the rod. Therefore, it moves with a jerk.

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When a charged body is brought in contact with the disc of a gold foil electroscope, the leaves of the electroscope get charged by conduction. This leads to the divergence of the leaves.
No, they do not diverge to the same extent because the magnitude of the charge is different.

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Charge will flow from one electroscope to the other until both acquire the same charge. The leaves of the second electroscope will diverge and the divergence of the leaves of the first electroscope will decrease, until the divergence of the leaves of both the electroscopes becomes the same.

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Lightning conductors are tall metal rods that are fixed on buildings to protect them from being damaged by lightning. If lightning happens to strike a building that has a lightning conductor, the charge passes harmlessly through the metal rod into the earth.

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A body can be charged by the following ways:
1. By rubbing
2. By induction
3. By conduction

Make two aluminium spheres A and B and attach them to sticks. Stand them on a table with the help of modelling clay. Now, allow the spheres to touch each other. Bring a negatively charged rod towards the sphere A and then move the sphere B away from it. Now move the rod away. We can observe that the sphere A will have a positive charge and the sphere B will have a negative charge. If we move the rod away before moving the sphere B, the charge inside the spheres will rearrange themselves, and both the spheres will be electrically neutral.

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A gold-leaf electroscope consists of two thin strips of gold attached to a metal rod, which is suspended inside a glass jar. The mouth of the jar is fitted with a rubber stopper, through which the rod passes. The other end of the rod is attached to a metal disc. Some electroscopes have strips of silver, copper or brass instead of gold.
When we bring a charged body in contact with the metal disc of an electroscope, the gold leaves get charged by conduction. They then diverge, indicating the presence of charge. The extent to which they diverge tells us about the magnitude of charge on the body we are testing.

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To determine the nature of the charge on a body, we have to first charge the electroscope with a known charge. If we charge the electroscope with a positively charged glass rod, the leaves of the electroscope will get positive charge and they will move apart. Then touch the electroscope with the body to be tested.
If the distance between the leaves of the electroscope increases, it means that the body is positively charged. If the distance between the leaves decreases, it means that the body is negatively charged.

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Clouds contain tiny crystals of ice and droplets of water, which move against each other. This causes a huge amount of charge to get built up in the clouds. Since air does not conduct the charge from the clouds, an accumulation of charge takes place in the clouds. This brings the clouds close to each other, and the charge jumps from one cloud to another through the air. This electric discharge causes lightning.



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(a)  they acquire equal and opposite charges
It is because when two bodies are rubbed, electrons are transferred from one body to the other.

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(c) the sphere close to the rod acquires a positive charge and the other sphere acquires a negative charge
This occurs due to induction.

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(b) A charged body repels a body carrying a similar charge, but attracts a body carrying the opposite charge, as well as a body carrying no charge.
This is because opposite charges attract each other and same charges repel each other.

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(d) to detect, measure and find the nature of the charge.
A gold-leaf electroscope is used to detect, measure and find the nature of the charge.

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(b) divergence of the leaves of A remains the same
A plastic ruler is a non-conductor. Hence, the divergence of the leaves of A will remain the same.

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(b) uncharged body acquires an equal and opposite charge
This is due to conduction; an uncharged body acquires an equal and opposite charge when it touches a charged body.

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(b) until they both carry the same charge
Charge flows from one body to another until both carry the same charge.

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1. Electrons carry negative charge.
2. While testing charge, repulsion is used as a proof of charge.
3. The force with which two similar charges repel each other depends on the amount of charge they carry.
4. The flow of charge through air or a gas is called an electric discharge.
5. A lightning conductor allows charge to harmlessly flow to the earth.



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