In an unloaded transformer, the fluxes limiting the primary and secondary are 30 mWb and 20 mWb. The coefficient of coupling is

In an unloaded transformer, the fluxes limiting the primary and second

1.	In an unloaded transformer, the fluxes limiting the primary and secondary are 30 mWb and 20 mWb. The coefficient of coupling is
Answer» Φ11 = (1 - k) Φ1 φ11 = φ1 - φ2 30 - 20 10 mWb 10 mWb = (1 - k) 30m 0.33 = 1 - k k = 0.67 .