Deepesh Tiwari

I am planning to put my 3 years old in Maharashtra board school. I have a fear that only icse or cbse students can crack all competitive exams like medical, engineering etc. Is this true? "kindly let me what will be best as I am very confused

one best and famous example are on Electromagnets Magnetism is a relativistic effect, and if you use electricity you can thank relativity for the fact that generators work at all. Electrical Transmission Towers [Pin It] Credit: long8614 | Shutterstock.com View full size image If you take a loop of wire and move it through a magnetic field, you generate an electric current. The charged particles in the wire are affected by the changing magnetic field, which forces some of them to move and creates the current. But now, picture the wire at rest and imagine the magnet is moving. In this case, the charged particles in the wire (the electrons and protons) aren't moving anymore, so the magnetic field shouldn't be affecting them. But it does, and a current still flows. This shows that there is no privileged frame of reference. Thomas Moore, a professor of physics at Pomona College in Claremont, California, uses the principle of relativity to demonstrate why Faraday's Law, which states that a changing magnetic field creates an electric current, is true. "Since this is the core principle behind transformers and electric generators, anyone who uses electricity is experiencing the effects of relativity," Moore said. Electromagnets work via relativity as well. When a direct current (DC) of electric charge flows through a wire, electrons are drifting through the material. Ordinarily the wire would seem electrically neutral, with no net positive or negative charge. That's a consequence of having about the same number of protons (positive charges) and electrons (negative charges). But, if you put another wire next to it with a DC current, the wires attract or repel each other, depending on which direction the current is moving. [9 Cool Facts About Magnets] Assuming the currents are moving in the same direction, the electrons in the first wire see the electrons in the second wire as motionless. (This assumes the currents are about the same strength). Meanwhile, from the electrons' perspective, the protons in both wires look like they are moving. Because of the relativistic length contraction, they appear to be more closely spaced, so there's more positive charge per length of wire than negative charge. Since like charges repel, the two wires also repel. Currents in the opposite directions result in attraction, because from the first wire's point of view, the electrons in the other wire are more crowded together, creating a net negative charge. Meanwhile, the protons in the first wire are creating a net positive charge, and opposite charges attract.

Hi, I have registered in UrbanPro days back. I want to teach Economics to class XI and XII and above students (CBSE syllabus preferred). Students can ask me 5 Questions daily on economics and I will be answering their Questions in between 7 PM to 9PM on daily basis. My problem is I am getting a number of such questions which are not related to economics. I want UrbanPro to send me only those questions which are related to economics. I would also like to know how students will contact me? Initially, I am not charging any money. Can anyone please help me in this regard?