Explanation :
It is given that,
Length of silicon bar, 
Free electron density, 
Hole density, 
The total current flowing in bar is the sum of drift current due to hole and the electrons.
where, n and p are electron and hole densities.
![J=Eq[n\mu_n+p\mu_p]](https://tex.z-dn.net/?f=J%3DEq%5Bn%5Cmu_n%2Bp%5Cmu_p%5D)
we know that 
So, ![J=\dfrac{V}{l}q[n\mu_n+p\mu_p]](https://tex.z-dn.net/?f=J%3D%5Cdfrac%7BV%7D%7Bl%7Dq%5Bn%5Cmu_n%2Bp%5Cmu_p%5D)
![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]](https://tex.z-dn.net/?f=J%3D%5Cdfrac%7B1.6%5Ctimes%2010%5E%7B-19%7D%5C%20C%7D%7B0.001%5C%20V%7D%5B104%5C%20cm%5E%7B-3%7D%5Ctimes%201200%5C%20cm%5E2%2FV%5C%20s%2B1016%5C%20cm%5E%7B-3%7D%5Ctimes%20500%5C%20cm%5E2%2FV%5C%20s%5D)
or
Current, 
A is the area of bar, 
So, 
Current, 
<em>So, the current flowing in silicon bar is </em>.
Answer C. The magnetic field changes direction too.
Answer:
C. All planets orbit the Sun in the same direction.
E. The orbits of the planets are evenly distributed in distance from the Sun.
F. All planets orbit the Sun in a roughly flat plane.
Explanation:
As we can see that due to big bang theory of planet formation we can say all planets revolve around the sun in circular orbit with almost in same plane
Size of the planets are unevenly distributed and they all revolve around the sun in same directions
so here correct options are
C. All planets orbit the Sun in the same direction.
E. The orbits of the planets are evenly distributed in distance from the Sun.
F. All planets orbit the Sun in a roughly flat plane.
The definition of incidence is In geometric optics, the angle of incidence is the angle between a ray incident on a surface and the line perpendicular to the surface at the point of incidence, called the normal.
Answer:
Explanation:
GIVEN
Force (F) = 8 N
Distance (d) = 2.5 metres
Work done = ?
WE know we have the formula
work done = F * d
Work done = 8 * 2.5
= 20 Joule
Hope it helps :)
