The electromagnetic force and/or torque, developed in any physical system, acts in such a direction as to tend to ____________
A. decrease the magnetic stored energy at constant mmf
B. decrease the magnetic stored energy at constant flux
C. increase the magnetic stored energy at constant flux
D. increase the magnetic stored energy at constant current
Answer:A
The electromagnetic force and/or torque, developed in any physical system, acts in such a direction as to tend to ____________
A. decrease the magnetic stored energy at constant mmf B. decrease the magnetic stored energy at constant flux C. increase the magnetic stored energy at constant flux D. increase the magnetic stored energy at constant current
Explanation: fe=-(∂Wfld (φ,x))/∂x= -(∂Wfld (∅,x))/∂x and Te=-(∂Wfld(φ,θ))/∂θ=-(∂Wfld (∅,θ))/∂θ