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Which of the following empirical relations used to find out the air gap length of a small three-phase induction motor?
𝑙𝑔=0.2+2 DL
𝑙𝑔 = 0.125 + 0.35𝐷 + 𝐿 + 0.015Va
𝑙𝑔 = 0.2 + 𝐷
All of these