Question

find resistance of copper wire of length 15 cm and radius 0.5 millimetre given is equal to 1.62 into 10 raise to the power minus 8 ohm metre​

Answer 1

$\green{ \: here \: is \: your \: answer \: }$

$\purple{ \huge{ \: resistance \: (r) \: = \: resistivity \times \frac{length \: (l)}{area \: ( \: a \: )}}}$


$\red{ \: given} \\ \blue{ \: length \: (l) \: = \: 15 \: cm \: = \: 0.15m} \\ \blue{ \: radius \: = \: 0.5 \: mm \: = \: 0.5 \times {10}^{ - 3} \: m} \\ \blue{ \: resistivity \: = \: 1.62 \times {10}^{ - 8} \: ohm \: {m} }$


$\blue{ \: area \: (a) \: = \: \pi \: {r}^{2} } \\ \blue { \: = \: \pi \: ({0.5 \: \times {10}^{ - 3} }^{2}) {m}^{2}} \\ \blue{ \: = \: 0.7850 \times {10}^{ - 6} {m}^{2} }$

Resistance (r) = ( 1.62×10^-8 ohm m )× 0.15m /
0.785×10^-6 m^2

= 0.30 ×10^-2 ohm


$\red{ \underline{ \huge{ \: answer : }}} \\ \ 0.30 \times {10}^{ - 2} ohm$


$\pink{ \bigstar{ \: hope \: it \: helps \: u}}$