Empirical Earth · Test It Yourself

The Faraday cage test — why you can block electricity but not gravity

The claim

“Gravity is really electrostatics, and a strong measurable force beats a weak invisible one.”

What is measured

Electric fields can be canceled to zero by a metal box. Gravity has never been blocked, reflected, or canceled by anything. That asymmetry is not a gap in engineering. It follows from the fact that charge comes in two signs and mass comes in only one, so there is nothing for gravity to cancel against.

What would show this is wrong

any material, arrangement or device that reduces the weight of an object placed behind it. A working gravity shield would be the most valuable object on Earth and would overturn general relativity overnight. A century of searching, from Faraday to Majorana to modern lunar laser ranging, has found no trace of one.

Sources

  1. Faraday’s search for a link between gravity and electricity (1849–1850). His diary for 19 March 1849 records the conviction that gravity must have “an experimental relation to Electricity, M link
  2. Faraday’s later attempts, and the Royal Society’s refusal. Around 1859–1860 Faraday again looked for an electrical effect from raising a heavy weight, believing gravity must be convertible i link
  3. Gravitational shielding: Majorana’s claim and the modern limits. Quirino Majorana reported (1918–1922) that mercury or lead around a suspended lead sphere slightly reduced its weight. Henry link
  4. Electrostatic shielding by a closed conductor. A grounded conducting enclosure is an equipotential volume, so the potential difference inside is zero and the interior is screened from extern link
  5. The electric wind of Venus (Collinson et al., 2016). The discovery paper: a global ambipolar electric field at Venus, measured with the ASPERA-4 electron spectrometer on Venus Express, five link
  6. Venus has potential, but not for water (ESA). The agency account of the same result: a surface pressure over 90 times Earth’s, a water abundance about 100 times lower, and an electric field link
  7. The atmosphere of Venus, a review. Composition 96.5 percent carbon dioxide and 3.5 percent nitrogen, total atmospheric mass 4.8×10 20 kg against 5.1×10 18 kg for Earth, surface pressure 92 b link
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