2 answers:
Answer:
we have:
At unit length
Resistance [R]=.....i
where
p: resistivity
L:length
A:area
when
length is strength 4 times
length will be 4L
Now
new equation becomes
Resistance[R] ==4
=4R
so
when A uniform resistance wire is stretched till it's length becomes four times. the resistance <u>increases by four times of its original resistance</u>.
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Answer:
Will be doubled.
Explanation:
For a capacitor of parallel plates of area A, separated by a distance d, such that the charges in the plates are Q and -Q, the capacitance is written as:
where e₀ is a constant, the electric permittivity.
Now we can isolate V, the potential difference between the plates as:
Now, notice that the separation between the plates is in the numerator.
Thus, if we double the distance we will get a new potential difference V', such that:
So, if we double the distance between the plates, the potential difference will also be doubled.