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
Allushta [10]
2 years ago
8

There is given an ideal capacitor with two plates at a distance of 3 mm. The capacitor is connected to a voltage source with 12

V until it is loaded completely. Then the capacitor is disconnected from the voltage source. After this the two plates of the capacitor are driven apart until their distance is 5 mm. Now a positive test charge of 1 nC is brought from the positively charged plate to the negatively charges plate. How large is the kinetic energy of the test charge? The test charge of 1 nC can be regarded to be so small that it does not influence the electric field between the two plates of the capacitor.​
Physics
1 answer:
Varvara68 [4.7K]2 years ago
3 0

Answer:

K = 2 10⁻⁸ J

Explanation:

Let's solve this exercise in parts, we start by finding the charge on each plate of the capacitor

          C = Q / ΔV

           C = ε₀ A / d

          ε₀ A / d = Q / ΔV

          Q = ε₀ A ΔV / d        (1)

indicate the potential difference ΔV₁ = 12 V, the distance between the plates d₁ = 3 mm = 0.003 m,  

as the power supply is disconnected and the capacitor is ideal the charge remains constant

in the second part we separate the plates at d₂ = 5 mm = 0.005 m, using equation 1

          ΔV₂ = \frac{Q d_2}{ \epsilon_o A}

we substitute the equation for Q

         ΔV₂ = \frac{d_2}{\epsilon_o A} \ \frac{\epsilon_o A \Delta V }{d_1}

         ΔV₂ = \frac{d_2}{d_1} \  \Delta V_1

in the third part we use the concepts of energy

starting point. Test charge near positive plate

          Em₀ = U = q ΔV₂

           

final point. Test charge near negative plate

          Em_f = K

energy is conserved

          Em₀ = Em_f

          q ΔV₂ = K

          K = q ΔV₁ \frac{d_2}{d_1}

we calculate

          K = 1 10⁻⁹  12  0.005/0.003

          K = 2 10⁻⁸ J

You might be interested in
Calculate the force at sea level that a boy of mass 50 kg exerts on a chair in which he is sitting.
kogti [31]

As per the question the mass of the boy is 50 kg.

The boy sits on a chair.

We are asked to calculate the force exerted by the boy on the chair at sea level.

The force exerted by boy on the chair while sitting on it is nothing else except the force of gravity of earth i.e the weight of the body .The direction of that force is vertically downward.

At sea level the acceleration due to gravity g = 9.8 m/s^2

Hence the weight of the boy w = mg  [m is the mass of the body]

we have m = 50 kg.

                             Hence w = 50 kg ×9.8 m/s^2

                                             =490 N kg m/s^2

                                              = 490 N

Here newton [N] is the unit of force.





6 0
3 years ago
Read 2 more answers
____________ is a medium-sized flat-topped hill with cliff-face sides that is taller than it is wide.
Luda [366]

Answer:

mesa

Explanation:



A mesa is a flat-topped mountain or hill. It is a wide, flat, elevated landform with steep sides. ... Spanish explorers of the American southwest, where many mesas are found, used the word because the tops of mesas look like the tops of tables.

5 0
2 years ago
I'm writing a story about Granny using old-fashioned laundry bluing to freshen dingy yellow clothes. I would like to explain WHY
Katena32 [7]

By combining blue with yellow light is like combining blue light with red and green light. The result of combining these three primary colors of light is to produce white light.

<h3>What is laundry bluing ?</h3>

Laundry bluing is a product adds a trace amount of blue dye to white fabric during laundering to improve its appearance.

Bluing products in higher concentrations can darken jeans and other blue cloth.

The blue overpowered the yellow to reflect white (at least the appearance of white to the human eye).

Blue and yellow are complementary colors that combine to reflect white, Fabrics.

Here,

Yellow light is a combination of red and green light. So combining blue with yellow light is like combining blue light with red and green light. The result of combining these three primary colors of light is to produce white light.

Learn more about White light here:brainly.com/question/16317768

#SPJ1

7 0
2 years ago
In what ways is n2 gas removed from the atmosphere?
MaRussiya [10]
One way of removing nitrogen gas from the atmosphere is by natural nitrogen fixation. This is done by nitrogen-fixing bacteria in the oceans and in the soil. Nitrogen fixation is a process that converts the nitrogen in air to ammonia.
3 0
3 years ago
A cart is moving to the right with a constant speed of 20 m s . A box of mass 80 kg moves with the cart without slipping. The co
nignag [31]

Answer:

Explanation:

Given

mass of box m=80 kg

coefficient of kinetic friction \mu _k=0.15

coefficient of Static friction \mu _s=0.30

cart is moving with constant velocity therefore Net Force is zero

Since there is no net acceleration therefore friction force will be zero

mathematically

f_r=ma

where f_r=frictional\ Force

a=acceleration

a=0

f_r=0

4 0
3 years ago
Other questions:
  • Which two factors does the power of a machine depend on?
    9·1 answer
  • Why can’t contour lines cross?
    8·1 answer
  • You drop a rock off the top of a building. It takes 4.5 s to hit the ground. How tall is
    6·1 answer
  • A light bulb is supplied with 100 J of energy each
    12·1 answer
  • Which statement best describes the difference between acceleration and velocity?
    15·1 answer
  • A scientist measuring the resistivity of a new metal alloy left her ammeter in another lab, but she does have a magnetic field p
    8·1 answer
  • Plz help, and show work
    6·1 answer
  • In this unit, the amount of solute is measured in?
    7·2 answers
  • Một xe ô tô chuyển động từ A đến B rồi về C khi từ A đến B xe chuyển động với tốc độ trung bình 50km/h, khoảng cách AB bằng 90km
    5·1 answer
  • Which best describes cost-effectiveness
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!