Give reason for the following
(a) The resistance of a thicker wire of copper is much less than that of a thinner wire of copper of the same length.
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Answers
Answer:
the resistance of a wire is inversly proportional to the area of the cross section of the wire.
thus when the wire is thick ie.the cross section of the wire is greater then the resistance will be less ,and will provide a larger path for the current to flow through it.when the area of the cross section of the wire is greater then the more amount of current is allowed to pass through it.
we may understand in a better way by taking a real life example;
suppose we have to go through a cave.
is the cave will be narrow then we will have more trouble to go through it.
if the cave is wider then we can easily go through it.
we can relate this example to the case of resistance.
I hope it would help you.
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we know that
R=V/I OR R=pl/A [where p=resistivity
l=length & A=area]
It depends on the resistivity of the wire