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02:09 IWF (Göttingen) German 2004

Kapazität einer Kugel

Experimental determination of the capacitance of a sphere.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
01:27 IWF (Göttingen) German 2004

Elektrischer Wind

At sharp corners, even small voltages can lead to large electric fields. They can ionize the surrounding air, making it electrically conducting.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
02:42 IWF (Göttingen) German 2004

Wirbelstrombremse

Forces are demonstrated which arise when an electric conductor moves through an inhomogeneous magnetic field.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
00:50 IWF (Göttingen) German 2004

Kräfte im elektrischen Feld

Between two surfaces separated only by a small gap, small voltages can lead to appreciable forces.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
01:22 IWF (Göttingen) German 2004

Seifenblasen im elektrischen Feld

The repulsive force between two bodies carrying charges of the same sign will be demonstrated.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
03:28 IWF (Göttingen) German 2004

Magnetischer Spannungsmesser

A long induction coil wound on a flexible hose is used to explore the magnetic field near current carrying conductors and also near a permanent magnet.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
03:10 IWF (Göttingen) German 2004

Induktion in bewegten Leitern

A conductor moving in a magnetic field experiences an electric field.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
03:04 IWF (Göttingen) German 2004

Induktion in ruhenden Leitern

A changing magnetic field generates an electric field.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
01:55 IWF (Göttingen) German 2004

Magnetisches Drehfeld

A rotating magnetic field results from the superposition of two magnetic fields oriented perpendicularly to each other, which vary sinusoidally with equal frequency, but with a phase difference, ideally of 90 degrees.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
02:28 IWF (Göttingen) German 2004

Elektromagnet

It will be shown that in a small electromagnet surprisingly large forces can be generated. However, these forces decrease drastically with the introduction of only a small gap between the pole faces.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
01:21 IWF (Göttingen) German 2004

Sphärische Aberration

The imaging error called "spherical aberration" is demonstrated by imaging a small coil of a light bulb.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
01:03 IWF (Göttingen) German 2004

Paramagnetische Materie

Paramagnetic matter gets pulled into regions of a large magnetic field. For the demonstration, liquid oxygen is poured into a shallow container placed in front of an electromagnet with non-parallel faces.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
01:33 IWF (Göttingen) German 2004

Induktionsläufer

Eddy currents induced in an aluminum disk in a moving inhomogeneous field tend to move the disk along with the field. This is the principle of the induction motor.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
01:48 IWF (Göttingen) German 2004

Reflexionskegel

The reflection of light is demonstrated using a polished steel tube. The reflected light has the shape of a cone.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
00:48 IWF (Göttingen) German 2004

Perspektive

Two-dimensional images of three-dimensional structures have a perspective, that is a certain ratio of size and distance for things which lie behind each other. The perspective depends on the position of the centers of the projection, which in imaging lie in the centers of the entrance- and exit-pupils. Using the images of two objects positioned at different distances from the imaging lens, the perspective and its changes will be shown.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
01:45 IWF (Göttingen) German 2004

Chromatische Aberration

Chromatic aberration occurs in imaging as result of the wavelength dependence of the index of refraction. It will be demonstrated on a special example.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
02:31 IWF (Göttingen) German 2004

Auflösungsvermögen

It is shown that in an optical image the individual light spots are diffraction patterns caused by the opening of the imaging lens. The resulting limit of the angular resolution is demonstrated with the aid of two pairs of holes with different separations.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
02:46 IWF (Göttingen) German 2004

Polarisiertes Licht

The plane of polarization of a light beam which has been polarized by passing it through a Nicol prism is made visible through scattering in a slightly milky liquid.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
01:16 IWF (Göttingen) German 2004

Krummer Lichtstrahl

A trough contains a sugar solution with a vertical concentration gradient, so that its index of refraction decreases with increasing height. A laser light beam enters the trough, tilted slightly against the horizontal direction. As it moves through the liquid, it is bent, as can be observed through scattering.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
01:58 IWF (Göttingen) German 2004

Astigmatismus

The imaging error called astigmatism occurs when light travels not parallel to the axis of the lens, but under an angle. Instead of image points, extended lines or streaks are formed.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
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