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Electric Charge (in Hindi)
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Definition of electric charge, Types of charge, Units and quantization of charge.

Udit Gupta is teaching live on Unacademy Plus

Udit Gupta
A Mechanical Engineer from NIT Allahabad here to help learners with physics. Also a Star ⭐ educator.

Unacademy user
Hello sir.. Im a BDS Prefinal student in govt dental college srinagar. My question is to DR. Roman saini sir. I watched videoS of yours.. I have all that motivation that courage everything.. .i mean just like a shell inside me which just need litle fire.. But Im not able to start....Anything for civils... I have enough time yet fah appearing in exam... I just need that firestick from you.... Plzzzzzzz sir this is my first and last question or help just give me a kick-start that what should i do im just stuck... .thanku
Sir this is enough for iit jee mains 2019
Udit Gupta
7 months ago
yes it is more than sufficient
sir this is enough for NEET or need anything else?
Udit Gupta
9 months ago
refer to the lessons that are in NEET course only.
Bhaiya jo alpha decay hota hai Usme jo energy difference aata hai vo kinetic energy ki form kyun chala jata hai vo heat nd sound energy ki form kyun nhi loss ho jata hai
Udit Gupta
a year ago
Alpha decay generally occurs in heavy nuclides. The funda behind such a decay is too much crowding. There cannot be 200 protons bound together if they dont have any neutrons. So when such a nucleus breaks, it helps the daughter nucleus become stable. Now an alpha particle is a bulky particle so it departs at around 5% speed of light and loses almost all of its energy in air in moving a few cms. The parent nucleus is "not able to afford that much crowding" and thats why there is no such "explosion", letting the alpha particle go with grace.
Aditi aggarwal
a year ago
Bhaiya when atomic collision takes place nd the collision is perfectly inelastic then where does the lost energy goes
Udit Gupta
a year ago
Generally you see it in form of fluorescence if the energy emitted lies in visible spectrum. Otherwise, particles are emitted in different frequencies of the spectrum which you might not perceive with naked eye. Moreover, these particles may be like photons which only have energy but no mass and these particles basically eat up the deficit energy in case of a perfectly inelastic collision.
Hello Bhiya course jab Khatam hoga
Udit Gupta
10 months ago
Theory is complete, questions have been done in a different course.

  2. Defining electric charge If we start dividing a material into its constituent particles (elementary particles), we reach three elementary particles that constitute a nucleus- electron, proton and neutron. Since all these particles carry mass, there is a force of attraction between them given by Newton's law of gravitation. Gm1m2 2

  3. Defining electric charge We also notice that when two electrons are placed close to each other there is a repelling force on both which tells us that there must be an extra force coming into play known as electric force. This force is generally very large as compared to the gravitational force. The property attributed to the presence of this electric force is called charge. A similar property was observed in case of protons as well. No such e came into play when we studied neutrons.

  4. Types of charge We know that a repelling electric force acts between two electrons or two protons. The force, however, becomes attracting in nature when we place a proton near an electron This brings us to the point that although the two entities are charged, there must be some difference to account for the attracting nature.

  5. Types of charge This brought us to a conclusion that electron and proton have different charge and that causes difference in types of force. We arbitrarily chose the charge on electron to be negative and that on proton to be positive. This does not mean that electron has a "lesser" charge than proton

  6. Units of charge The S.I. unit of charge is Coulomb (C) By definition we say, the charge passing through a wire is 1C if a current of 1A is flowing for 1s through it. The charge on a proton is e = 1.6 10-1%. The charge on an electron is-1.6 10-1%.

  7. Quantization of charge The fact that charges occur in form of electron and proton means that charge can only exist as an integral multiple of 1. 6 x 10-19c, or we say charge is quantized. If we say that an object has a charge 2.4 x 10-19C, it is not possible. The reason is that for this amount of charge, there must be 1.5 protons and this violates quantization of charge.