Question

Electromagnetic Waves - Physics Tutorial

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A long, thin steel wire is cut in half, and each half is connected to different terminal of a light bulb. An electromagnetic (EM) plane wave In what direction is the wave propagating? Explain your reasoning. Suppose the wire were oriented parallel to the y-axis, as shown above Would the bulb glow in this case? Explain. Suppose instead that the wire were positioned as described below. Would the brightness of the bulb be greater than less than, or equal to the brightness that it had in part b? Explain your reasoning in each case. The wire is parallel to the y-axis but with its bottom end located on the x-axis (i.e., the wire is shifted upward a distance equal to half its length) The wire is tilted so that it makes an angle of 40degree with respect to the y-axis but is still parallel to the y-z plane.

Answer 1

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An electromagnetic field (also EMF or EM field) is a physical field produced by electrically charged objects. It affects the behavior of charged objects in the vicinity of the field. The electromagnetic field extends indefinitely throughout space and describes the electromagnetic interaction. It is one of the four fundamental forces of nature (the others are gravitation, weak interaction and strong interaction).

The field can be viewed as the combination of an electric field and a magnetic field. The electric field is produced by stationary charges, and the magnetic field by moving charges (currents); these two are often described as the sources of the field. The way in which charges and currents interact with the electromagnetic field is described by Maxwell's equations and the Lorentz force law.

From a classical perspective in the history of electromagnetism, the electromagnetic field can be regarded as a smooth, continuous field, propagated in a wavelike manner; whereas from the perspective of quantum field theory, the field is seen as quantized, being composed of individual particles

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1. Gauss's Law

$\nabla \cdot \mathbf{E} = \frac {\rho}{\epsilon_0}$

2. No Magnetic Monopole Law

$\nabla \cdot \mathbf{B} = 0$

3. Faraday's Law

$\nabla \times \mathbf{E} = - \frac {\partial \mathbf{B}}{\partial t}$

4. Amp