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  2. Beam diameter - Wikipedia

    en.wikipedia.org/wiki/Beam_diameter

    The 1/e 2 width is equal to the distance between the two points on the marginal distribution that are 1/e 2 = 0.135 times the maximum value. In many cases, it makes more sense to take the distance between points where the intensity falls to 1/e 2 = 0.135 times the maximum value.

  3. Magnetometer - Wikipedia

    en.wikipedia.org/wiki/Magnetometer

    The difference in the oscillations when the bar was magnetised and when it was demagnetised allowed Gauss to calculate an absolute value for the strength of the Earth's magnetic field. [9] The gauss, the CGS unit of magnetic flux density was named in his honour, defined as one maxwell per square centimeter; it equals 1×10 −4 tesla (the SI ...

  4. List of superconductors - Wikipedia

    en.wikipedia.org/wiki/List_of_superconductors

    The table below shows some of the parameters of common superconductors.X:Y means material X doped with element Y, T C is the highest reported transition temperature in kelvins and H C is a critical magnetic field in tesla.

  5. Gauss's law for gravity - Wikipedia

    en.wikipedia.org/wiki/Gauss's_law_for_gravity

    In physics, Gauss's law for gravity, also known as Gauss's flux theorem for gravity, is a law of physics that is equivalent to Newton's law of universal gravitation. It is named after Carl Friedrich Gauss. It states that the flux (surface integral) of the gravitational field over any closed surface is proportional to the mass enclosed. Gauss's ...

  6. Stocks recover most of losses from tumble set off by Trump ...

    www.aol.com/stocks-fall-early-trading-trump...

    Tesla, the electric carmaker led by Elon Musk, saw its stock price drop about 0.5%. MORE: What to know as tariffs go into effect on Mexico, Canada, China.

  7. Maxwell's equations - Wikipedia

    en.wikipedia.org/wiki/Maxwell's_equations

    The integral version of Gauss's equation can thus be rewritten as = Since Ω is arbitrary (e.g. an arbitrary small ball with arbitrary center), this is satisfied if and only if the integrand is zero everywhere. This is the differential equations formulation of Gauss equation up to a trivial rearrangement.

  8. Electrostatics - Wikipedia

    en.wikipedia.org/wiki/Electrostatics

    Electrostatics is a branch of physics that studies slow-moving or stationary electric charges.. Since classical times, it has been known that some materials, such as amber, attract lightweight particles after rubbing.

  9. Specific absorption rate - Wikipedia

    en.wikipedia.org/wiki/Specific_absorption_rate

    Specific absorption rate (SAR) is a measure of the rate at which energy is absorbed per unit mass by a human body when exposed to a radio frequency (RF) electromagnetic field.