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VARISHA PARVEZ
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Asked: 2023-05-08T06:20:57+00:00 In:

In a doubly excited magnetic systems, the magnetic torques and forces act in such a direction as to tend to ___________ a) decrease the field energy at constant currents b) decrease the field co-energy at constant currents c) increase the field energy at constant currents d) none of the mentioned

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In a doubly excited magnetic systems, the magnetic torques and forces act in such a direction as to tend to ___________ a) decrease the field energy at constant currents b) decrease the field co-energy at constant currents c) increase the field energy at constant currents d) none of the mentioned
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    1. Answer: c

      Explanation: Te = ∂Wfld(is,ir,θr)/∂θr = ∂Wfld

      1

      (is,ir,θr)/∂θr

      fe = ∂Wfld(is,ir,x)/∂x = ∂Wfld

      1

      (is,ir,x)/∂x

      The positive sign in the formula indicates that force/torque acts in a direction as to tend to increase

      both field energy and co-energy.

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