Copper is one of the suitable material to make connecting wires due to its low resistivity. What do you mean by resistivity?

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Copper is one of the suitable material to make connecting wires due to its low resistivity. A copper wire is in the form of a cylinder and has a resistance R. It is stretched till its thickness reduces by half of its initial size. Find its new resistance in terms of R.

What do you mean by leaching?

What do you mean by eddy current?

What do you mean by impulsive force?

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