Exercise 5 Solution
... At O, the velocity is zero, so there is no cutting of magnetic field lines, hence no emf is induced. When the bar swings down, PE is changed into KE, so the speed is increasing, hence the cutting of magnetic field lines is increasing, so induced emf is increased. When the bar swings down after reach ...
... At O, the velocity is zero, so there is no cutting of magnetic field lines, hence no emf is induced. When the bar swings down, PE is changed into KE, so the speed is increasing, hence the cutting of magnetic field lines is increasing, so induced emf is increased. When the bar swings down after reach ...
Final - Kuniv.edu.kw
... 2. An insulating rod is bent into the shape of a semi-circle as shown in the figure. The left half has a negative charge –Q distributed uniformly along its length and the right half has a positive charge +Q distributed uniformly along its length. Which vector shows the correct direction of the net e ...
... 2. An insulating rod is bent into the shape of a semi-circle as shown in the figure. The left half has a negative charge –Q distributed uniformly along its length and the right half has a positive charge +Q distributed uniformly along its length. Which vector shows the correct direction of the net e ...
اﻟﻔﯾزﯾﺎء ( ﺑﺎﻟﻟﻐﺔ اﻻﻧﺟﻟﯾزﯾﺔ
... 3) If the intensity of incident light on a metal surface (whose frequency is greater than the critical frequency) in an evacuated tube is increased to double. (with respect to the maximum kinetic energy of emitted electrons from the metal). 4) If the poles of the battery are reversed in the shown fi ...
... 3) If the intensity of incident light on a metal surface (whose frequency is greater than the critical frequency) in an evacuated tube is increased to double. (with respect to the maximum kinetic energy of emitted electrons from the metal). 4) If the poles of the battery are reversed in the shown fi ...
Paper - Kendriya Vidyalaya IIT Chennai
... b) What is space wave propagation? Which two communication methods make use of this mode of propagation? If the sum of the heights of transmitting and receiving antenna in line of sight of communication is fixed at h, how that the range is maximum when the two antenna have a height h/2 each. ...
... b) What is space wave propagation? Which two communication methods make use of this mode of propagation? If the sum of the heights of transmitting and receiving antenna in line of sight of communication is fixed at h, how that the range is maximum when the two antenna have a height h/2 each. ...
Announcements l Help room hours (1248 BPS) LON-CAPA #6 due Oct. 18
... Note some similiarities: • magnetic field lines originate on N poles and terminate on S poles But there are differences: • I can separate the + charge and the - charge of an electric dipole, leaving me with a single electric charge Can’t do that with a magnetic dipole: a N pole is always accompanied ...
... Note some similiarities: • magnetic field lines originate on N poles and terminate on S poles But there are differences: • I can separate the + charge and the - charge of an electric dipole, leaving me with a single electric charge Can’t do that with a magnetic dipole: a N pole is always accompanied ...
Propagation of electromagnetic waves
... 2. The polarization of molecules in the air (molecules that produce their own electric field in the absence of external forces) The water molecule consists of three atoms, one O and two H. Each H donates an electron to the O so that each H carries one positive charge and the O carries two negative c ...
... 2. The polarization of molecules in the air (molecules that produce their own electric field in the absence of external forces) The water molecule consists of three atoms, one O and two H. Each H donates an electron to the O so that each H carries one positive charge and the O carries two negative c ...
Section-A - CBSE PORTAL
... increased then what will be the effect on (1) current flowing from the cell, (2) potential difference required to stop the current completely? Section-B 1. Two hollow conductors are charged positively, the smaller is at 50V and the bigger is at 100V. How should they be arranged such that the charge ...
... increased then what will be the effect on (1) current flowing from the cell, (2) potential difference required to stop the current completely? Section-B 1. Two hollow conductors are charged positively, the smaller is at 50V and the bigger is at 100V. How should they be arranged such that the charge ...
Superconductivity
Superconductivity is a phenomenon of exactly zero electrical resistance and expulsion of magnetic fields occurring in certain materials when cooled below a characteristic critical temperature. It was discovered by Dutch physicist Heike Kamerlingh Onnes on April 8, 1911 in Leiden. Like ferromagnetism and atomic spectral lines, superconductivity is a quantum mechanical phenomenon. It is characterized by the Meissner effect, the complete ejection of magnetic field lines from the interior of the superconductor as it transitions into the superconducting state. The occurrence of the Meissner effect indicates that superconductivity cannot be understood simply as the idealization of perfect conductivity in classical physics.The electrical resistivity of a metallic conductor decreases gradually as temperature is lowered. In ordinary conductors, such as copper or silver, this decrease is limited by impurities and other defects. Even near absolute zero, a real sample of a normal conductor shows some resistance. In a superconductor, the resistance drops abruptly to zero when the material is cooled below its critical temperature. An electric current flowing through a loop of superconducting wire can persist indefinitely with no power source.In 1986, it was discovered that some cuprate-perovskite ceramic materials have a critical temperature above 90 K (−183 °C). Such a high transition temperature is theoretically impossible for a conventional superconductor, leading the materials to be termed high-temperature superconductors. Liquid nitrogen boils at 77 K, and superconduction at higher temperatures than this facilitates many experiments and applications that are less practical at lower temperatures.