Question

The coefficients of self induction of two inductance coils arc 0.0 1H and 0.03H respectively. When they are connected in series so as to support each other. then the resultant self inductance becomes 0.06 Henry. The value of coefficient of mutual induction will be-

• A. 0.02 H
• B. 0.05 H
• C. 0.01 H
• D. ZERO

Answer 1

The correct option is C 0.01 H

$L1=0.01$

$L2=0.03$

$Leff=0.06$

$Leff=L1+L2+2M$

$0.06=0.01+0.03+2M$

$2M=0.06-0.03$

$M=0.03/2$

$=0.015$