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Two inductors when connected in series with additive connection, their equivalent inductance is 400 µH and when same inductors connected in series with subtractive connection, their equivalent inductance is 300 µH. Find their mutual inductance.
  • a)
    700 µH
  • b)
    25 µH
  • c)
    100 µH
  • d)
    125 µH
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
Two inductors when connected in series with additive connection, their...
Let two inductors are L1 and L2 and their mutual inductance is M.
When both inductors are in additive connection

When both inductors are in subtractive connection

Subtracting equation (i) and (ii)
100 = 4M
M = 100/4 = 25 µH
Mutual inductance will 25 µH.
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Two inductors when connected in series with additive connection, their equivalent inductance is 400 µH and when same inductors connected in series with subtractive connection, their equivalent inductance is 300 µH. Find their mutual inductance.a)700 µHb)25 µHc)100 µHd)125 µHCorrect answer is option 'B'. Can you explain this answer?
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