Ncert Exercises & Solutions

There are two coils A and B separated by some distance. If a current f 2A flows through A, a magnetic flux of 10^-2 Wb passes through B (no current through B). If no current passes through A and a current of 1 A passes through B, What is the flux through A?

Hint: The passing through each coil depends on the mutual inductance.

Step 1 : Applying the mutual inductance of coil A with respect to coil B :

M_{21} = \frac{N_{2} ϕ_{2}}{I_{1}}

Therefore, we have;

Mutual inuctance = \frac{10^{- 2}}{2} = 5 mH

Step 2 : Again applying this formula for other case

N_{1} ϕ_{1} = M_{12} I_{2} = 5 mH \times 1 A = 5 mWb .

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