1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Lera25 [3.4K]
3 years ago
13

What minimum radius must a large conducting sphere of an electrostatic generating machine have if it is to be at 20000 V without

discharge into the air?
How much charge will it carry?
Physics
1 answer:
zmey [24]3 years ago
6 0
First of all,

The electric field at the surface of the sphere is given by


 E = kQ/r²

The field strength at which breakdown occurs in the air is <span>3.0 MV/m
</span>
So,  E = 3.0 MV/m

<span>The sphere potential is defined as

 V = kQ/r</span>

<span>If we divide E/V  we get

 E = V/r </span>

<span>r = V/E  = 20000V / 3.10^6 V/m  =  6.66 </span>10^-3 m = 6.66 mm

2. Charge

<span>V = kQ/r .............>>
</span>
Q = Vr/k = 20000V *( 6.66 10^-3 m)/ (9.10^9 N m2/C2) = 1.481 10^-8 C

You might be interested in
Which is most likely the length of a student’s textbook?
UkoKoshka [18]

For this case, what we must do is to rewrite these measurements in the same unit in order to compare them.

By writing the measurements in meters we have:

30 mm = (30) * (\frac{1}{1000}) = 0.030 m

30 cm = (30) * (\frac{1}{100}) = 0.30 m

30 dm = (30) * (\frac{1}{10}) = 3 m\\30 Hm = (30) * (100) = 3000 m

Therefore, physically the correct measure is:

0.30 m = 30 cm

Answer:

the length of a student's textbook most likely is:

30 centimeters

3 0
4 years ago
Read 2 more answers
For an individual ( not a repair station) to conduct a complete 100 hour inspection on an aircraft and approve it for return to
Oliga [24]

Answer:

For an individual ( not a repair station) to conduct a complete 100 hour inspection on an aircraft and approve it for return to service requires a mechanic certificate with and powerplant and airframe ratings

Explanation:

Because these are important certificates issued by the FAA giving the mechanic authority to inspect to inspect an aircraft and approve its return to services

8 0
3 years ago
What is the ohms law
Anton [14]
The Ohm's law is I(the strength of the current flowing in a conductor)= V(the potential difference applied to the ends) divided by R(resistance)
4 0
4 years ago
The color of an object we see is determined by the
aksik [14]

Answer:

An object appears white when it reflects all wavelengths and black when it absorbs them all. Red, green and blue are the additive primary colors of the color spectrum. Combining balanced amounts of red, green and blue lights also produces pure white.

Explanation:

7 0
3 years ago
The quantity of charge through a conductor is modeled as Q = (3.00 mC/s4)t4 − (2.00 mC/s)t + 9.00 mC. What is the current (in A)
Mumz [18]

Answer:

The current at time t = 4.00 s is 0.766 A.

Explanation:

Given that,

The quantity of charge through a conductor is modeled as :

Q=(3t^4-2t+9)\ mC

We need to find the current (in A) at time t = 4.00 s. We know that the rate of change of electric charge is called electric current. It is given by :

I=\dfrac{dQ}{dt}\\\\I=\dfrac{d(3t^4-2t+9)}{dt}\\\\I=12t^3-2

At t = 4 s

I=12(4)^3-2=766\ mC/s\\\\I=0.766\ C/s=0.766\ A

So, the current at time t = 4.00 s is 0.766 A. Hence, this is the required solution.

7 0
3 years ago
Other questions:
  • A motorist enters a freeway at 45 km/h and accelerates uniformly to 99 km/h. From the odometer in the car, the motorist knows th
    9·1 answer
  • The two cyclists travel at the same speed on level ground. They approach a low hill and decide to coast up instead of hard pedal
    13·1 answer
  • Calculate the total energy of 4.0 kg object moving horizontally at 20 m/s 50 meters above the surface.
    15·1 answer
  • Calculate the electric potential energy in a capacitor that stores 4.0 10-10 C of charge at 250.0 V
    5·2 answers
  • force f is separated ingto two , components, p and q, which are at a right angle to each other. what are the values of p and q?
    11·1 answer
  • A series circuit consists of a 100-ω resistor, a 10.0-μf capacitor, and a 0.350-h inductor. the circuit is connected to a 120-v
    13·1 answer
  • A nonzero net force acts on a particle and does work. Which one of the following statements is true?
    15·1 answer
  • A composite material is to be designed with epoxy (Em 3.5 GPa) and unidirectional fibers. The longitudinal elastic modulus of th
    9·1 answer
  • How long did it take our planet to produce the fossil fuels we're using today?
    8·2 answers
  • How can humans use their knowledge of changing states of matter to better society? (ex. A human can harness the thermal energy f
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!