A Gradient of deformation tensor-rigid body

merav1985
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Is there a criterion for a gradient of deformation tensor to be describing a rigid body??
 
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merav1985 said:
Is there a criterion for a gradient of deformation tensor to be describing a rigid body??
How can a rigid body have a non-null deformation tensor?
 

Thread 'Off resonant driving of a MW/RF cavity'

Hello! Let's say I have a cavity resonant at 10 GHz with a Q factor of 1000. Given the Lorentzian shape of the cavity, I can also drive the cavity at, say 100 MHz. Of course the response will be very very weak, but non-zero given that the Loretzian shape never really reaches zero. I am trying to understand how are the magnetic and electric field distributions of the field at 100 MHz relative to the ones at 10 GHz? In particular, if inside the cavity I have some structure, such as 2 plates...
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