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Sagot :
The resistance, R, of a wire varies directly with it's length,L and it's inversely propotional with it's cross sectional area A.
⇒ length,L = 500cm.
cross sectional area A = 0.04cm
resistance, R= 0.25ohms
Formula: [tex]\frac{RA}{L}[/tex] = K.
[tex]\frac{(0.25)(0.04)}{500}[/tex] = K
0.01 = 500K.
Learn more about the equation that relates resistance, area and length here
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