# 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.
VINAY said:
1 decade ago

m=1(L1+L2)^1/2

SURI said:
1 decade ago

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

Ambuj said:
1 decade ago

Suri what is the value of k.

ASHA said:
1 decade ago

K IS THE COEFFICIENT BETWEEN TWO COILS

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

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

Tito said:
1 decade ago

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

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)

Bala ram said:
8 years ago

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

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.

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