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Arturiano [62]
3 years ago
8

A piece of silicon sample has a resistivity of 0.1 ω.Cm. Its thickness is 100µm. The electron mobility is 1350cm 2 v -1sec-1. Wh

en a magnetic field of bz and an ix of 1ma is supplied, the hall voltage is found out to be -70µv. Calculate the electron concentration (#/cm3 or #/m3 ) of the silicon sample and bz (in wb/m2 ). Suppose the concentration of holes can be neglected.
Physics
1 answer:
lawyer [7]3 years ago
5 0

The answer is Rh = 135 cm^3 and B = 0.05185 wh/m^2


Explanation:

Resitivity of silicon = 0.1

thickness = 100um

so, I = ma

Required to find out concentration of electron , we know that

Rh = up

By putting in the values,

Rh = 1350 x 0.1

Rh = 135 cm^3


Now consider,

Rh = 1 / Rh.q

= 1 / Rh . q

= 1 / 135 x1.609 x10^-19

= 4.6037 x 10^16 / cm^3

Vh = BIRh / w

B = Vh w/ IRh

B = -70 x10^-6 x 100 x10^-6 / 1x 10^-3 x 135 x 10^-6

B = 0.05185 wh / m^2


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Answer:

Force of 37.8 × 10^(6) N attracts the two charges

Explanation:

The force between two charges is given by

F = k*q1*q2/r²

Where q1 and q2 are 0.06 C and 0.07 C.

r is the distance between q1 and q2 which is equal to 3 m

k is a constant = 9 × 10^(9) N.m²/C²

F = (9 × 10^(9) × 0.06 × 0.07)/3²

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A hydraulic car jack needs to be designed so it can lift a 2903.57 lb car assuming that a person can exert a force of 24.41 lbs.
marishachu [46]

Answer:

Diameter of the piston would be 0.71 m (71.1 cm)

Explanation:

From the principle of pressure;

\frac{F_{1} }{A_{1} } = \frac{F_{2} }{A_{2} }

Let F_{1} = 2903.57 lb, F_{2} = 24.41 lbs, r_{2} = 3.26 cm = 0.0326 m.

A_{2} = \pi r^{2}

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So that:

\frac{2903.57}{A_{1} } = \frac{24.41}{0.00334}

A_{1} = \frac{2903.57*0.00334}{24.41}

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A_{1} = 0.4 m^{2}

The radius of the piston can be determined by:

A_{1} = \pi r^{2}

0.3973 = \frac{22}{7} x r^{2}

r^{2} = \frac{0.3973*7}{22}

   = 0.1264

r = \sqrt{0.1264}

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r = 0.36 m

Diameter of the piston = 2 x r

                                     = 2 x 0.3555

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A ball is thrown down vertically with an initial speed of 20 m/s from a height of 60 m. Find (a) its speed just before it strike
vivado [14]

Answer:

Explanation:

Ball is thrown downward:

initial velocity, u = - 20 m/s (downward)

height, h = - 60 m

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(a) Let the speed of the ball as it hits the ground is v.

Use third equation of motion

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Use First equation of motion

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Use third equation of motion

v^{2}=u^{2}+2as

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(d) Let t be the time taken

Use First equation of motion

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