Question

A metallic wire or radius 1 = 1mm and r2 = 2mm has current 20 A. Find J and drift velocity n = 9×10^29​

Answer 1

${ { \huge{ \bold{Heya \: Mate!}}}}$

${\underline{ { \bold{Here's \: the\:Answer !}}}}$

Question ➭ A metallic wire of radius¹ = 1 mm and radius ² = 2mm has a current of 20 A . Find J in A and B and driftvelocity if n = 9×$10 {}^{29}$

Answer ➭ Firstly we convert the radius into m by multiplying it by $10{}^{-3}$

•Then we have

➭Current Density J => $\frac{ I}{A}$

➭ In A :

= 20/πr² ( r =1 mm)

= $\frac{20}{3.14×10^-6}$

➭ ${ { { \bold{Current \:Density\: in \:A\: is \: 6.33 × 10^6 !}}}}$

➭ In B :

= 20/πr² ( r = 2 mm)

= $\frac{20}{3.14× 4 ×10^-6}$

➭ ${ { { \bold{Current \:Density\: in \:B\: is \: 1.56 × 10^6 !}}}}$

${\underline{Drift\: velocity }}$ →

Using

${{{\bold{ I = n.e.A.Vd }}}}$

Vd = $\frac{20×10^-3}{14.04}$

➭ ${ { { \bold{Drift \:Velocity\: is \:1.1 × 10^-5 !}}}}$

${\red { \huge{ \bold{Hope \: Helps!}}}}$

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Answer 2

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