Question

The self inductance of two coils are 4mH and 9mH respectively. If the coefficient of
coupling is 0.5, the mutual inductance between the coils is
a. 6.5mH
b. 18mH
c. 3mH
d. 12.5mH​

Answer 1

Answer:

M=3

Explanation:

M=k✓L1L2

m= mutual inductance

k=coupling factor

Answer 2

Given,

Self inducatance of two coils=4mH and 9mH

Coupling coefficient=0.5

To Find,

Mutual inductance between the coils.

Solution,

We have the formula to find mutual inductance,

M=K×√I1.I2

  =0.5×√4.9

 =0.5×√36

 =0.5×6

 =3mH

Hence,mutual inductance between the coils 3mH.