The question is: "Two traveling waves are superposed on the same string. Waves are y1=Asin (ωt−kx) and y2=Asin(ωt+kx).The distance between adjacent nodes of the resulting standing wave is: "
This is the question I have tried to solve.
I know that the distance between two nodes is 2pii. Then...
That is the key!
I got for the algebraic expression: r = emf/I - R.
where r = internal, R = external
So this explains why the r = -R
when emf = 0 or the voltage is zero.
But how can the internal resistance be negative?
If my expression is right, then the result should be the intercept...
Yes, that is completely true but can it be that simple when I have a situation where the resistance is actually the net resistance of a voltmeter and of a resistor. I did an experiment where I used many resistors of different resistances and measured the voltage across each different resistor by...
Yes, I agree.
Then again the units I got are so weird V * ohm that I do not know them. I tried to deduct some other units VR = R^2*I but without result.
In this problem, I know I, V and R. I am calculating the internal R of a coil voltmeter when I have data about V over a resistor and V...