Question

A copper wire of cross sectional area 0.01mm2 is used to prepare a resistance of . The resistivity of copper is . Calculate the length of the wire​

Answer 1

Answer:

0.6 km

Explanation:

ρcu=1.7×(10−8)w−m,

A=0.01mm2=0.01×(10−6)(m2)

R=1kw=103w

So,R=ρla

⇒(103)=(1.7×(10−8)×l10−8)

l=1031.7=0.58×(103)m

=0.6km .