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Which of the following is used to find the actual speed of the rotor?
= ๐ต๐โ๐ต
= (๐ต๐โ๐ต)/๐ต๐ ร ๐๐๐
= (๐ต๐โ๐ต)/๐ต๐
= ๐ต๐ (๐โ๐บ)