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Abstract: We present measurement results demonstrating that a conducting lead sphereexposed to electromagnetic e-m waves in the infrared IR regime, isattracted by e-m waves. The result may seem surprising and against conventionalwisdom that electromagnetic wave forcing should lead to a repulsive force.Nonetheless, all our experiments show that the attractive force can bedetermined quantitatively, and that they are reproducible. Our experiment setupis a Cavendish torsion-balance experiment with lead spheres, one of the spheresintermittently irradiated by IR light. Because the Cavendish experiment is wellknown, simple, and readily available, the results can be easily verified orfalsified. However, to avoid Bernoulli and other external forcing effects, theentire experimental setup should be placed in a vacuum chamber. In our case theexperiments were performed at \approx 4 \cdot 10^-7 mbar. One of the 20 g leadspheres was intermittently irradiated by infrared radiation from a lamp coveredby an aluminium foil. Two independent experiments V1 and V2 are described.Besides showing that wave energy and momentum transfer leads to attraction, wealso describe some experimental requirements and constraints. The lamp waspowered on during 10 or 12 s, the power changing between 8, 16, and 26 W. Allmeasurements, including those affected by lamp out-gassing, shows that theattracting force on the lead sphere increases with increasing irradiativeenergy. From the V2 experiment, preceded by lamp -baking- to eliminaterepulsive out-gassing forces, the irradiative energy 8.7 Ws on the sphereresulted in a total force 2.9+-0.5\cdot 10^-9 N. From the V2 experiment wealso derive a power law relation between incident radiation energy W and theattractive force, corresponding to F=2.8\cdot 10^-10 W^1.1, with R^2=0.95.



Author: Hans Lidgren, Rickard Lundin

Source: https://arxiv.org/







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