positive capacitance negative
this means that negative inductance causes negative energy stored in inductor!
there r some arguiing about this in physics.. For anyone interested refer:
http://www.physicsforums.com/archive.../t-167245.html
I don′t think that we have a "logical" or a physical problem with a negative inductance.
The reason is that we have a kind of simplified wording to speak of a "negative" inductance. In fact, we mean that there is a minus sign in the equation desribing the relation between voltage and current: v=(-1)*Ldi/dt.
Thus, the factor (-1) forces the current to lead the voltage by 90 deg. That′s all.
As before, L is still a factor determined by external conditions and can be regarded as positive - without any problems with energy definition. But in this case we must not forget to allocate the minus sign to the expression di/dt.
Of course, by deriving the formula given above we have to change the direction of the current (or of the voltage) from the beginning if we try to describe a part which has the properties which we call "negative" inductance.
I don′t think that we have a "logical" or a physical problem with a negative inductance.
The reason is that we have a kind of simplified wording to speak of a "negative" inductance. In fact, we mean that there is a minus sign in the equation desribing the relation between voltage and current: v=(-1)*Ldi/dt.
Thus, the factor (-1) forces the current to lead the voltage by 90 deg. That′s all.
As before, L is still a factor determined by external conditions and can be regarded as positive - without any problems with energy definition. But in this case we must not forget to allocate the minus sign to the expression di/dt.
Of course, by deriving the formula given above we have to change the direction of the current (or of the voltage) from the beginning if we try to describe a part which has the properties which we call "negative" inductance.