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In analogy to the proposed gravitational "fifth" force, limits can be set on the range λ and the strength β of an electrical fifth force. Specifically we consider the potential V=(e²r)(1+βe^-rλ) and show that there is a region near λ=1 {μ}m where existing experiments set relatively poor limits on β.
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Bartlett et al. (1988) studied this question.
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