One of these three challenges Einstein addresses is the relationship between Maxwell

One of these three challenges Einstein addresses is the relationship between Maxwell

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One of these three challenges Einstein addresses is the relationship between Maxwell's  electromagnetic equations and the mechanical worldview. Scientists in Einstein's day  searched for a unifying theory that would explain both electromagnetism and  mechanics. Einstein was attracted to this problem because he was troubled by an  electromagnetic principle that did not make sense according to the mechanical world  view: Faraday's 1831 magnet-coil experiment. In this experiment, a magnet is moved  near an electric circuit, and then the circuit is moved near the magnet. According to  Faraday, an electric current should be formed whenever there is relative movement,  regardless of whether the magnet or the circuit is moving. However, according to  Maxwell's equations, an electric current is only induced when the circuit is at rest and  the magnet moving. This asymmetrical explanation disturbed Einstein, who was 
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