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Calculate the number 817

NUMBERMANIA: Calculate the number 817 using numbers [8, 3, 2, 9, 93, 551] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 2

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Faraday experiment

In 1831, Michael Faraday wound a thick iron ring on one side with insulated wire that was connected to a battery. He then wound the opposite side with wire connected to a galvanometer. He found that upon closing the battery circuit, there was a deflection of the galvanometer in the second circuit. Then he was astonished to see the galvanometer needle jump in the opposite direction when the battery circuit was opened. He had discovered that a current was induced in the secondary when a current in the primary was connected and an induced current in the opposite direction when the primary current was disconnected.eb

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