GKFix MCQ Question

How is the flux Φ₁ through the smaller coil calculated in the concentric coil setup?

• A. Φ₁ = πr₂² × B₂
• B. Φ₁ = I₂ × R
• C. Φ₁ = πr₁² × B₂
• D. Φ₁ = E × t