Question

hllo guys!!❤️❤️

Answer the following questions ⤵️⤵️

A copper wire has a diameter 0.5 mm and resistivity 0.6 10-8 ohm metre.

i) what will be the length of the wire to make the resistance of 12 ohm?

ii)how much will be the resistance of another copper wire of same length but half the diameter?
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Answer 1

Explanation:

Area of cross-section of the wire, A =? (d/2) 2 

Diameter= 0.5 mm = 0.0005 m 

Resistance, R = 10 ?

We know that 



? length of the wire = 122.72m 

If the diameter of the wire is doubled, new diameter=2�0.5=1mm=0.001m 

Let new resistance be R? 



? the new resistance is 2.5 ?

Answer 2

Answer:

Above answer is perfect

Explanation:

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