The electromagnetic force developed in any physical system acts in such a direction as to tend to _____________
A. decrease the co-energy at constant mmf
B. increase the co-energy at constant flux
C. decrease the co-energy at constant flux
D. increase the co-energy at constant mmf
Answer:A
The electromagnetic force developed in any physical system acts in such a direction as to tend to _____________
A. decrease the co-energy at constant mmf B. increase the co-energy at constant flux C. decrease the co-energy at constant flux D. increase the co-energy at constant mmf
Explanation: fe=(∂Wfld1 (i,x))/∂x=(∂Wfld1 (F,x))/∂x, the positive sign before ∂Wfld1 indicates that force fe acts in a direction as to tend to increase the co-energy at constant mmf.