Gravity has traditionally been defined as a force of attraction between things that have what

Find the current that flows in a silicon bar of 10-μm length having a 5-μm × 4-μm cross-section and having free-electron and hol

alexdok [17]

Explanation :

It is given that,

Length of silicon bar, $l=10\mu m= 0.001\ cm$

Free electron density, $n_e=104\ cm^3$

Hole density, $n_h=1016\ cm^3$

$\mu_n=1200\ cm^2/Vs$

$\mu_p=500\ cm^2/Vs$

The total current flowing in bar is the sum of drift current due to hole and the electrons.

$J=J_e+J_h$

$J=nqE\mu_n+pqE\mu_p$

where, n and p are electron and hole densities.

$J=Eq[n\mu_n+p\mu_p]$

we know that $E=\dfrac{V}{l}$

So, $J=\dfrac{V}{l}q[n\mu_n+p\mu_p]$

$J=\dfrac{1.6\times 10^{-19}\ C}{0.001\ V}[104\ cm^{-3}\times 1200\ cm^2/V\ s+1016\ cm^{-3}\times 500\ cm^2/V\ s]$

$J=1012480\times 10^{-16}\ A/m^2$

or

$J=1.01\times 10^{-9}\ A/m^2$

Current, $I=JA$

A is the area of bar, $A= 20\mu m=0.002\ cm$

So, $I=1.01\times 10^{-9}\ A/m^2\times 0.002\ m^2$

Current, $I=2.02\times 10^{-12}\ A$

<em>So, the current flowing in silicon bar is </em> $I=2.02\times 10^{-12}\ A$ .

7 0

4 years ago

Tom is going to your left at 90% of the speed of light and Joan is going to your right at 90% of the speed of light. What will T

MrMuchimi

Answer:

You are moving away from him at 90% the speed of light. Joan is moving away from him at as speed that is faster than 90% of the speed of light but slower than the whole speed of light.

Explanation:

According to relativity, you cannot exceed the speed of light.

8 0

4 years ago

give me some like COD and mafia 3 like games please! I want like more gore, guts and glory, So for yall gamers out there, give m

Svetlanka [38]

Answer:

any black ops i started playing crysis 3 its good and gta5

Explanation:

3 0

3 years ago

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Work output of a large machine in a factory is 89,000 joules, and it’s input is 102,000 joules. Work output of a similar machine

mojhsa [17]

(89000/102000)×100
=87.25%

(92000/104000)×100
=88.46%

efficiency is (output/input)×100
if u get confused which way input and output should go, remember the smaller value is always output and it's above in the fraction, then only it's possible to get a efficiency lower than 100.

7 0

3 years ago

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Josh is designing a lab to separate a mixture of sulfur powder and iron filings. He looks at all the ways to separate a mixture

Stolb23 [73]

Answer:

D) magnetic attraction

Explanation:

Mixture consists of sulfur powder and iron filings . The former is non magnetic and the later is magnetic material . The best way to separate them is to use a magnet . This method is called magnetic separation method . A magnet will attract the iron filling but the sulfur will remain un-attracted . Thus, the two will get separated from each other.

6 0

3 years ago

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