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C B vT If the width of river is d. The three conterminous edges of a parallelopiped are The volume of parallelopiped is : a 36 cubic unit b 45 cubic unit c 40 cubic unit d 54 cubic unit 56. If any pdf file have any copyright voilation please inform us we shell remove that file from our website. Read: 0 by admindc pandey optics and modern physics solutions PDF..
Best SSC CGL study material for both tier 1 and tier 2 is available here to check. In other words, electric current is a measure of the amount of electrical charge transferred per unit time across any cross-section.
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Electric Current Current is the flow of charged particles through a conducting medium, such as a metal wire. In other words, electric current is a measure of the amount of electrical charge transferred per unit time across any cross-section. The electric current through any cross-section is 1 ampere if 1 coulomb charge flows across it in 1 second. It means the direction of electric current is opposite to the direction of electrons. On the basis of variation of its direction, the two main types of current are: Direct Current in which the flow electric current is only in one direction and Alternating current whose magnitude changes with time and reverses its direction periodically. Electric current is a scalar quantity. Although electric current possesses both magnitude and direction, yet it is not a vector quantity because it does not obey the rules of vector addition. Thus, the arrow heads used to indicate the direction of current in electric circuit is simply indicate the direction of flow of positive charge. Electric currents add and multiply like scalar quantity. Current Density Current density as word itself suggests is the density of current. It is an another way to describe the flow of charge. The electric current density at a point in the conductor is defined as the electric current per unit area around the given point and in a direction perpendicular to the area. It may be noted that it is the characteristic property of point inside the conductor nor the conductor as a whole. In SI units, the electric current density is measured in amperes per square metre. Current density is important to design the electrical and electronic systems. Circuit performance depends strongly upon the designed current level and the current density then is determined by the dimensions of the conducting elements. For example, as integrated circuits are reduced in size, despite the lower current demanded by smaller devices, there is trend toward higher current densities to achieve higher device number in ever smaller chip areas. High current densities have undesirable consequences. Most electrical conductors have finite, positive resistance, making the dissipate power in the form of heat. The current density must be kept sufficiently low to prevent the conductor from melting or burning up. Unit of Resistance The unit of resistance is called ohm symbol Ω. This equation indicates the two variables that would affect the amount of current in circuit. The current in a circuit at constant temperature is directly proportional to the electric potential difference impressed across its ends and inversely proportional to the total resistance offered by the external circuit. It means when voltage of the battery is increased, current through the circuit also increases and when resistance is increased, the current decreases. The graph between V and I is expected to be a straight line which is not obtained for higher values of current. But at a certain voltage Knee voltage , the current increases abruptly. Serial Number Name Author Type of Book Description 1 Concepts of Physics H. Verma Text-book for Basics Best for Mechanics, Electrostatics, Optics, Modern Physics, Heat and waves. The book contains high quality solved numerical problems which would be of a great help in understanding the method of solving problems. Irodov Problems and solutions Consists of high level problems. Best for Mechanics, Electricity and Mechanism, modern Physics 4 Fundamentals of Physics Resnick, Halliday, Walker Reference Book Good for Mechanics, Electricity and Magnetism, Heat. Pandey Reference Book Consists of many solved problems. However must be used for reference only after understanding the basics properly 6 University Physics Sears and Zemansky Reference Book Good numerical problems 7 Elements of Dynamics S. Not recommended if there is time constraint. Lee Reference Book 7 IIT Chemistry O. Agarwal Reference Book Highly recommended 8 Numerical Chemistry R. Mukerjee Reference Book 9 Physical Chemistry P. Atkins Reference Book 10 Numerical Chemistry P. Bahadur Reference Book Solved numerical problems are good. Chemical and Ionic Equilibrium have been explained well. Agarwal Text Book for Basics X and XII 2 NCERT Maths Text Book for Basics CBSE prescribed books for XI and XII 3 High school mathematics Hall and Knight Reference Book 4 New Pattern Mathematics fot IIT JEE M. Khanna Reference Book 5 Algebra made easy K. Basu Reference Book 6 A problem book in Mathematical analysis G. Berman Reference Book 7 Calculus and analytic geometry Thomas and Finney Reference Book 8 Coordinate geometry S. Loney Reference Book Highly recommended book by coaching centres 9 Problems in calculus of one variable I. Maron Reference Book Considered very good for Differential Calculus 10 TMH Course in Mathematics for IIT JEE Tata McGraw Hill Publications Reference Book 11 Plane Trigonometry S. Loney Reference Book The book contains detailed conceptual knowledge of the subject. Great for strengthening the basics of Trigonometry. Great for understanding Vectors 12 Higher Algebra Bernard and Child Reference Book A high level book. Must be referred after an advanced understanding of the subject.