Question

What is Mutual Inductance between Two Coils?

Answer

Mutual Inductance between Two Coils - (i)If two coil (1 and 2) also called primary and secondary coils are placed close to each other (maximum coupling), then mutual inductance between them [M = B₁ N₁ N₂ A₂/I₁] (ii) If the coils are two concentric coplaner circular coils, then mutual inductance between them [M = πμ₀ N₁ N₂ r²/2R] ⇒ M ∝ r²/R (iii) For two solenoids tightly wound to each other as shown below Magnetic field inside the primary solenoid, B₁ = μ₀ n₁ I₁ (n₁ = N₁/I) Thus, [M = μ₀ N₁ N₂ A/l]