a copper wire has diameter 0.5mm and resistivity of 1.6×10 to the power 8 ohm meter .what should be the length of this wire to make its resistance 10 ohm plz answer guys plz !!!!!
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a copper wire has diameter 0.5mm and resistivity of 1.6×10 to the power 8 ohm meter .what should be the length of this wire to make its resistance 10 ohm plz answer guys plz !!!!!
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Answer:
80. ------------------------
Explanation:
just use the formula
R=r L/A
where r is resistivity L is length and A is area of the wire
I think the resistivity should be of the power -8 cause copper is a good conductor
so
L=RA/r =250*π/6.4= 122.7 metre