# Electronics - Transformers - Discussion

Discussion Forum : Transformers - General Questions (Q.No. 3)

3.

The coefficient of coupling between two coils is 0.45. The first coil has an inductance of 75 mH and the second coil has an inductance of 105 mH. What is the mutual inductance between the coils?

Discussion:

11 comments Page 1 of 2.
Sunil sharma said:
1 decade ago

Let coefficient of coupling b/w two coils is = K.

So, K = 0.45.

First coil inductance(L1) = 75mh.

Second " " " (L2) = 105mh.

Mutual inductance(M) = k/square root of (L1*L2).

M = 0.45*square root(75*105).

M = 39.9.

So, K = 0.45.

First coil inductance(L1) = 75mh.

Second " " " (L2) = 105mh.

Mutual inductance(M) = k/square root of (L1*L2).

M = 0.45*square root(75*105).

M = 39.9.

(1)

Mega.k said:
7 years ago

Mutual inductance(M)=k*√(L1*L2).

Formula : K=M/√(L1*L2) for finding coefficient coupling,

So the answer is 0.45*88.74 = 39.9mH ,

M=K *√(L1*L2) for finding mutual inductance.

Formula : K=M/√(L1*L2) for finding coefficient coupling,

So the answer is 0.45*88.74 = 39.9mH ,

M=K *√(L1*L2) for finding mutual inductance.

Xyz said:
1 decade ago

Coefficient of coupling (K) = 0.45

L1 = 75 mH

L2 = 105 mH

Mutual inductance M = k/(Root of L1 * L2)

M = 0.45 / Root of L1 * L2

M= 39.9 mH

L1 = 75 mH

L2 = 105 mH

Mutual inductance M = k/(Root of L1 * L2)

M = 0.45 / Root of L1 * L2

M= 39.9 mH

Mani said:
1 decade ago

M=k*(L1*L2)^(1/2)

where K=co-efficient of coupling

that is given as K=.45

where K=co-efficient of coupling

that is given as K=.45

Bala ram said:
8 years ago

Mutual inductance formula is M = K * root(L1*L2).

ASHA said:
1 decade ago

K IS THE COEFFICIENT BETWEEN TWO COILS

Ambuj said:
1 decade ago

Suri what is the value of k.

Tito said:
1 decade ago

M = K*square root(L1 X L2).

Sukruth said:
6 years ago

M = K * √(L1*L2).

SURI said:
1 decade ago

m=k*(L1*L2)^1/2

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