9:00 PM – RRB JE 2019 | Electrical Engg by Ashish Sir | Magnetism | Jabar Post Indonesia

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9:00 PM – RRB JE 2019 | Electrical Engg by Ashish Sir | Magnetism | Jabar Post Indonesia

Electricity is the set of physical phenomena associated with the presence and motion of matter that has a property of electric charge. In early days, electricity was considered as being unrelated to magnetism. Later on, many experimental results and the development of Maxwell’s equations indicated that both electricity and magnetism are from a single phenomenon: electromagnetism. Various common phenomena are related to electricity, including lightning, static electricity, electric heating, electric discharges and many others.

The presence of an electric charge, which can be either positive or negative, produces an electric field. The movement of electric charges is an electric current and produces a magnetic field.

When a charge is placed in a location with a non-zero electric field, a force will act on it. The magnitude of this force is given by Coulomb’s law. Thus, if that charge were to move, the electric field would be doing work on the electric charge. Thus we can speak of electric potential at a certain point in space, which is equal to the work done by an external agent in carrying a unit of positive charge from an arbitrarily chosen reference point to that point without any acceleration and is typically measured in volts.

Electricity is at the heart of many modern technologies, being used for:

electric power where electric current is used to energise equipment;
electronics which deals with electrical circuits that involve active electrical components such as vacuum tubes, transistors, diodes and integrated circuits, and associated passive interconnection technologies.
Electrical phenomena have been studied since antiquity, though progress in theoretical understanding remained slow until the seventeenth and eighteenth centuries. Even then, practical applications for electricity were few, and it would not be until the late nineteenth century that electrical engineers were able to put it to industrial and residential use. The rapid expansion in electrical technology at this time transformed industry and society, becoming a driving force for the Second Industrial Revolution. Electricity’s extraordinary versatility means it can be put to an almost limitless set of applications which include transport, heating, lighting, communications, and computation. Electrical power is now the backbone of modern industrial society.[1]

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  1. You haven't able to explain alot of things in this lecture
    1) the direction of C vector
    2)the very last question
    Sir plz I am not complaining that you don't have knowledge we all know you r much more experience than us n u have abundance of knowledge BT plz make sure that u explain things quite clearly so that we can understand it in better way.
    Regards:: Not regular BT parmanent student of WiFi studies

  2. ab tk ka sabse worst lecture of magnetism kch samj ni aa rha kr kya rhe ho ek b topic clear ni hua aaj… jisme direction of force to blkul nhi… kbi kisko move kra rhe ho kbi kisko… students kuch bole to direct block krte ho😥

  3. Sir biot savart law me "u•"(mue not) ka value bhi "4π x 10^-7" hai or equation me bhi divide me 4π hai, to fr "u•" dene se kya faeda wo to cancel hojaega, to kya hm "u•" aur 4π ko hata kr direct hm "10^-7" lekr bhi aage badh sakte h ya nhi.. Please explain sir..

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