By Félix Salazar Bloise, Rafael Medina Ferro, Ana Bayón Rojo, Francisco Gascón Latasa

ISBN-10: 3662483661

ISBN-13: 9783662483664

ISBN-10: 3662483688

ISBN-13: 9783662483688

This e-book offers the basic options of electromagnetism via issues of a quick theoretical advent initially of every bankruptcy. the current e-book has a robust didactic personality. It explains all of the mathematical steps and the theoretical recommendations hooked up with the advance of the matter. It courses the reader to appreciate the hired tactics to profit to resolve the workouts independently.

The routines are established in a similar fashion: The chapters commence with effortless difficulties expanding steadily within the point of hassle. This e-book is written for college students of physics and engineering within the framework of the hot ecu Plans of analysis for Bachelor and grasp and in addition for tutors and lecturers.

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**Extra info for Solved Problems in Electromagnetics**

**Example text**

It is equivalent to say that, if we do not touch or enclose holes, and ∇ × F = 0 simultaneously in this subregion of D, we can also find a scalar function V (r) so that F = −∇V . Hence, a closed integral must be zero (curve 2 in Fig. 13) and an open integral from A to B (curve 3 ) will only depend on the endpoints A and B. The aforementioned definitions were focused on the rotational of a vector field. In the same way we can also define other kinds of fields if we look at divergence. So, the vector fields that have zero divergence (∇ · F = 0) are called solenoidal fields.

81) 22 1 A Mathematical Introduction Fig. 13 Multiply connected domain D. The line integral around 1 is not zero. However, the same calculation along 2 is zero. 80). 80) is fulfilled but the closed curve holes (curve 1 , Fig. , ∂S F · dl = ∂S dF = 0 . 84) This result shows that for multiply connected regions (see Fig. 13) the necessary condition ∇ × F = 0 to have a potential so that F = −∇V is not sufficient. When it happens we say that the differential form dF is closed. 81) and we can say that all exact 1− f or m are closed, but the converse is false unless the region G is simply connected.

123) hence, the gradient of V in cylindrical coordinates is ∇V (ρ, φ, z) = ∂V 1 ∂V ∂V , , ∂ρ ρ ∂φ ∂z . 124) For calculating a similar expression in spherical coordinates, we will follow the same procedure. 125) and developing the scalar product d V (r, φ, θ) = (∇V )r dr + (∇V )φ r sin θ dφ + (∇V )θ r dθ. 126) The differential with respect to r , φ and θ is d V (ρ, φ, z) = ∂V ∂V ∂V dr + dφ + dθ. 130) therefore, the gradient in spherical coordinates has the form ∇V (r, φ, θ) = 1 ∂V 1 ∂V ∂V , , ∂r r sin θ ∂φ r ∂θ .

### Solved Problems in Electromagnetics by Félix Salazar Bloise, Rafael Medina Ferro, Ana Bayón Rojo, Francisco Gascón Latasa

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