Potential In parallal combination of resistors

Shayan shan
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Why is the Potential Difference equal in parallel combination of resistances ?
 
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Shayan shan said:
Why is the Potential Difference equal in parallel combination of resistances ?
Why do you think it is? Can you draw a diagram showing parallel resistors and indicate the potential difference across each resistor?
 

Thread 'Derivation of Hamilton's Principle: Questions'

I have recently been really interested in the derivation of Hamiltons Principle. On my research I found that with the term ##m \cdot \frac{d}{dt} (\frac{dr}{dt} \cdot \delta r) = 0## (1) one may derivate ##\delta \int (T - V) dt = 0## (2). The derivation itself I understood quiet good, but what I don't understand is where the equation (1) came from, because in my research it was just given and not derived from anywhere. Does anybody know where (1) comes from or why from it the...
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