Two coils N1 and N2 turns are would concentrically on a straight cylindrical core of radius r and permeability µ. The windings have length \[{l_1}\] and \[{l_2}\] respectively as shown in figure.
The mutual inductance will be
1. Proportional to N1, N2
2. Proportional to µ
3. Inversely proportional to \[{l_1}\]
4. Inversely proportional to r2
Which of these statements are correct?

A. 1, 2, 3 and 4
B. 2, 3, and 4 only
C. 1, 2, and 3 only
D. 1, 3 and 4 only
Answer: Option C

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