## Electromagnetic fieldsThis revised edition provides patient guidance in its clear and organized presentation of problems. It is rich in variety, large in number and provides very careful treatment of relativity. One outstanding feature is the inclusion of simple, standard examples demonstrated in different methods that will allow students to enhance and understand their calculating abilities. There are over 145 worked examples; virtually all of the standard problems are included. |

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Page 251

13-3 The Force between

conclusions about an integrand from the nature and value of a definite integral,

we have done it before, for example in getting (7-29), and we will be doing it

again.

13-3 The Force between

**Current Elements**Although it is often unwise to drawconclusions about an integrand from the nature and value of a definite integral,

we have done it before, for example in getting (7-29), and we will be doing it

again.

Page 256

By means of this procedure, then, we have introduced another vector field B

which we can calculate at any field point r by means of (14-2) even if there is no

all ...

By means of this procedure, then, we have introduced another vector field B

which we can calculate at any field point r by means of (14-2) even if there is no

**current element**there to have a force on it. Again, as for E, one can regard this asall ...

Page 532

Suppose the first has an oscillating

produced in the other. If we assume that they are far apart, the electric field

produced by the

to write that ...

Suppose the first has an oscillating

**current**I in it; we want to find the emf 6produced in the other. If we assume that they are far apart, the electric field

produced by the

**element**Ids, can be obtained from (27-92), but it will be helpfulto write that ...

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amplitude angle assume axes axis becomes bound charge boundary conditions bounding surface calculate capacitor charge density charge distribution charge q circuit conductor consider constant coordinates corresponding Coulomb’s law cross section current density current element cylinder defined dielectric displacement distance electric field electromagnetic electrostatic energy equal evaluate example Exercise expression field point Flgure flux force free currents frequency function Galilean transformation given incident induction infinitely long integral integrand length located loop Lorentz Lorentz transformation magnetic dipole magnitude material Maxwell’s equations medium normal components obtained origin parallel particle perpendicular plane wave plates point charge polarized position vector produced quadrupole quantities radiation radius rectangular reﬂected region relation result rotation satisfy scalar potential shown in Figure solenoid sphere substitute surface charge surface current tangential components transformation unit vacuum vector potential velocity volume write written xy plane zero