Which of the following expressions for the energy stored in a magnetic field in terms of inductance L, reluctance R, and flux linkage Ψ are correct?
1) \(\frac{1}{2} \) × L × i2
2) \(\frac{1}{2} \) × R × Ψ2
3) \(\frac{1}{2} \) × R × MMF2
4) \(\frac{1}{2} \) × Ψ × i
1
1, 3 and 4
2
2, 3 and 4
3
1, 2 and 3
4
1, 2 and 4