What will happen if a glass rod is rubbed on a silk cloth it becomes positively charged True or false?

Option 2 : Silk cloth and rubber balloon

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10 Questions 10 Marks 15 Mins

Concept:

Charging By Friction -

Since charges are produced in pairs, rubbing creates charges of equal magnitude but opposite nature on the two bodies.
This charging phenomenon is known as charging by friction.
This rubbing of two objects leads to the creation of static electricity.

Static Electricity -

Static electricity is described as an imbalance of electric charges in a body, specifically the imbalance of negative and positive charges on a body.
The charge imbalance is caused by physical means.
Contact between solid objects is one of the most common causes of static electricity.
Rubbing produces the spark that you get when you step on a wool carpet, for example.
Rubbing can also trigger static cling in a clothes dryer. Similarly, lightning occurs as a result of air movement in some weather conditions. You may also rub a balloon against your hair, and the static electricity produced would cause the balloon to adhere to a wall, similar is rubbing a glass rod against a silk cloth.
The net charge on the two rubbed bodies device is zero.
Role of electrons -
- Electrons are the only electric charge moving in static electricity.
- Electrons in materials are kept extremely loosely, which means they can be exchanged through simple touches, such as rubbing.
- These charges may accumulate on the surface of an object until they are released or discharged.
- The electric field generated by stationary charges is referred to as static electricity.
- The material's surface thus contains several electric charges that combine the static electricity on that material. These static charges can form on the surface or by interaction with one of the most charged bodies, or they can form as a result of extra ions in the air.

Explanation-

Due to rubbing a glass rod with a silk cloth,

The glass rod has free electrons that are lost and given to the silk cloth
Thus, the glass rod loses electrons and hence becomes positively charged
The silk cloth is now having extra electrons hence gains a negative charge

Due to rubbing a rubber balloon with woollen cloth,

An inflated rubber balloon can be charged by rubbing it against the woollen cloth.
Upon rubbing, the wool loses electrons and it causes the electrons to move from the wool to the balloon's surface.

So, Silk cloth and rubber balloon both become negatively charged.

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Question 1 Objective Questions - II

Q1) Write true or false

(a) the number of electrons and protons in an atom are same.

(b) If the charge is not in motion, we call it static electricity.

(d) When an ebonite rod is rubbed with fur, the electrons move from ebonite to fur.

(e) When, glass rod is rubbed with dry silk cloth, the electrons move from glass to silk.

(f) The cap of gold leaf electroscope is made of copper.

(g) If a glass rod rubbed with silk is brought near the cap of a negatively charged electroscope, the divergence of leaves will decrease.

(h) In induction, a positively charged body can make an uncharged body positively charged.

(i) A lightning conductor saves the building from lightning.

(j) WHen a comb is rubbed with dry hair both comb and paper get similarly charged.

(k) A glass rod rubbed with silk repels an ebonite rod rubbed with fur.

(l) When an ebonite rod is rubbed with fur. The protons move from the ebonite rod to the fur.

(m) A conductor has a large number of free electrons.

(n) An ebonite rod can be charged by touching it with a charged copper rod.

(o) To find whether a body is charged or not, an uncharged electroscope is used.

(p) To find whether the charge on a body is positive or negative, an uncharged electroscope is used.

(q) If a negatively charged rod is brought near a negatively charged pith ball electroscope, the pith ball will be stuck with the rod.

Answer:

Solution:

(a) True

(b) True

(d) False

(e) True

(f) False

(g) True

(h) False

(i) True

(j) False

(k) False

(l) False

(m) True

(n) False

(o) True

(p) False

(q) False

Video transcript

"""hello students welcome to Lido learning's question and answer videos my name is padlibi and i teach science and maths at Lido so here we have a very interesting question about fill in the s we have to fill in the s and i'm sure you all must be looking at this picture right i'm sure all of you must love music or musical instruments so this question especially for those who like to play some musical instrument or the other so let's go ahead with the question oh before going ahead let's just understand what do we mean by high-pitched sound how does a high-pitched sound wave look like look at this and how does a low pitched sound wave looks like also we should know that pitch is of a sound is dependent on frequency this is another point which we have to remember while we answered this question another thing frequency is given as the inverse of the time period so frequency is inverse of time series so let's go ahead and start with filling up the plants so the first question says the time period of a wave is 2 seconds so its frequency is now from this formula we know that frequency is 1 upon 2 because 2 seconds is the time period so this comes out to be 0.5 second inverse or we may write it as 0.5 seconds inverse right because it is per second or 0.5 upon second right the pitch of a stringed instrument is increased by now we have to give an answer to this so what happens to the pitch of a string instrument so all of you must have seen a stringed instrument like a guitar let's say we are talking about a guitar so when we increase so now we are talking about the tension industry so guitar is a string instrument so if we increase the tension if we increase the tension let me write that down here so if we increase the tension in the string then the frequency increases now we know that pitch is directly proportional or depends on frequency so pitch of a stringed instrument can be increased by increasing the tension in the string because as a result frequency will increase if frequency increases pitch will also increase now let's talk about those of you who play float so a pitch the pitch of a float is decreased by now flute has an air column so we can decrease the pitch by increasing the length so when we increase the length of the air column in a flute again the frequency decreases so when we increase the length of the air column frequency decreases as a result pitch also decreases now let's go ahead to the next question that is smaller the membrane then higher will be the pitch so for instrument this also is much similar to the one which we used one the b example right that is when we increase the tension in the string of guitar pitch also increase similarly if the membrane that is if you can see the drum over here it has a membrane on top of it so smaller is the membrane higher is the pitch of that instrument now let's go ahead with the next one that is if a drum is beaten hard what happens to its loudness of course we all know the answer to this that it also increases so when you beat a drum hard the loudness also increases now let's talk about the last part now this is something which we you all need to remember so a tuning fork produces a sound of single frequency this is something which we need to remember that is all it always gives out sound of one frequency that is a single frequency so i hope this part was clear if you have any further questions please post your comments below thank you """

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