If the data don't support your hypothesis, you don't just go and look for some other experiment that will support it. You dig deeper into this experiment, find out why, and maybe tweak the hypothesis. Eventually you wind up with a hypothesis that IS supported by experiment. Then you've got yourself a theory ! The choice is C.
We use only one variable at a time to find the accurate result. We want to see how the result of experiment changes everytime with a single variable.
Here two vectors are given of lengths
now let say the two vectors are inclined at some angle with each other
so the resultant is given as
now plug in all values
Now for maximum resultant the angle between two vectors must be ZERO degree
Now for minimum resultant the angle between two vectors must be 180 degree
It is the copper penny as it is metal and wood, plastic, and glass do not conduct electricity.