Can you please explain what is the refrance point os this example??

Answer 1

Voltage is always relative; we can only measure the voltage between two points. So we pick a reference, a point in the circuit we call ground, and declare that point is zero volts. In this problem we assign point #M(0,0,5)# the value zero volts. Then we measure other voltages relative to #M.#

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Answer 2

Adrian Ayala

It seems like you're referring to an example or a specific context, but without further information, I can't provide a specific reference point. Could you please provide more details or clarify your question?

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.