in what form are electric and magnetic fields propagated from an oscillating dipole

Liked this question? Tell your friends about it

3 Answers

Order by
Oldest to Newest
Newest to Oldest

Let us consider the high school level work first and then we will work up to actual physics.

First, let us discuss the basics of Ampere's Law of Magnetic Fields.  Then we will discuss Maxwell's Correection to Ampere's Law.

\oint_{\partial \Sigma} \mathbf{B} \cdot \mathrm{d}\boldsymbol{\ell} = \mu_0 I + \mu_0 \varepsilon_0 \iint_{\Sigma} \frac{\partial \mathbf E}{\partial t} \cdot \mathrm{d}\mathbf{S} \oint_{\partial \Sigma} \mathbf{H} \cdot \mathrm{d}\boldsymbol{\ell} = I_f + \iint_{\Sigma} \frac{\partial \mathbf D}{\partial t} \cdot \mathrm{d}\mathbf{S}


We may readily see that the amount of current applied to a winding is not ABSOLUTELY proportional to the field generated: we have impedence and radiative field losses, and we have Maxwell retention in field windings.

Conversely, Maxwell states that we have conservation of energy in that collapsing fields do not collapse instantaneously.  Here we invoke Faraday's First Law, which we will discuss separately.

Guard, protect and cherish your land, for there is no afterlife for a place that started out as Heaven. Charles M. Russell, Montana, 1929.

Look at the second integral.  Basically it says that current applied to an adjoining conductor that also has current will cause both fields to increase by the number of windings in the coil.  Now, let's look at the usual dipole in a 2-meter FM antenna.  We see the Hertz Opposition: the dipoles are each 1/4 wave and then go to 1/16 wave monopoles set 90 degrees from each other.

The lead that meets the transmitting-receiving dipole must be at even wavelengths, meaning we have to mount the mast at 4, 8, 12, 16, or 20 meters and use a "thumb-buster" coil to dial in the exact SWR.

During transmission, the dipole will feel the signal and it will radiate in a torus at 90 degrees from the axis of the dipole, and the monopoles will assure that you do not suffer SSB-backfeed during reception.

The enemy we fight is hatred itself. Those who hate are merely prisoners of war, brainwashed to do the enemy's bidding. Those who overcome leftist hate have won the final and only important victory: we have overcome all when we overcome hate.

Leftists are evil. Obatso is a drunk from Kenya. Leftists are racists. Republicans must vote for their own kind. The south will rise again. I pity leftists.

Related Questions

Other people asked questions on similar topics, check out the answers they received:

Asked: Physics ! Calculate the electric potential energy ...

Physics ! Calculate the electric potential energy in a capacitor that stores 4.0 10-10 C of charge at 250.0 V.

Asked: Need help for physics concept :Free fall bodies

If two different bodies with different masses are in free fall, they have same acceleration. What is the reason? Can anyone explain it?

Asked: Physics question ! Please help!

Calculate the electric potential energy in a capacitor that stores 4.0 x 10^-10 C of charge at 250.0 V.

Ask a Question... We'll forward it to people who know

More Questions

How much physical education is required in ...

According to me, Physical Education is necessary for elementary students in order to maintain the health of every student. MBA thesis writing | Thesis editing and proofreading | For blogs Thesis proofreading services

What is difference in physical activity, exercise and sport? I need

Physical ativity is basically any movement. Brushing your teeth. Combing your hair. Walking. Eating. Even sleeping is a physical activity. Exercise is an activity designed to increase fitness and overall health, usually by either aerobic or resistance training. Walking, jogging, weighlifting and ...


DC motor is best for constant operation.


DC motors exist in these variants: Shaded Pole (a magnet induces AC or DC to a three-coil armature and causes revolution. These are small motors, used to drive fans and analog clocks, etc. Series Wound Universal. The field winding is wound one way and the armature is wound oppositely. These ...