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
frozen [14]
3 years ago
7

A parallel plate capacitor is attached to a battery to create a potential difference of 12V The battery is then disconnected and

a dielectric material is inserted to fill the gap with no loss of charge. A voltmeter then reads a difference of 3V 1. What is the dielectric constant of the material? 2. What fraction of energy was lost when the dielectric was inserted 3. If we pull the dielectric half way out with no read across the capacitor? charge escaping what woulda volt meter
Physics
1 answer:
Nina [5.8K]3 years ago
6 0

Answer:

a) 4

b) \frac{3}{4}

c) 6 volts

Explanation:

Given:

Initial potential difference, V₁ = 12 V

Potential difference after inserting the dielectric, V₂ = 3 V

Now,

a) The charge is given as, q = CV

where, C is the capacitance

thus,

without dielectric, q = C × 12 = 12C     .........(1)

now, let the dielectric constant be 'k'

therefore,

q = kCV₂

or

12C = kC × 3          (q from 1)

or

k = 4

b) Now, the energy after inserting a dielectric with dielectric constant as k become the \frac{1}{k} times the energy without the dielectric

thus,

Final energy = \frac{1}{k} × Initial energy

or

Final energy = 0.25 × Initial energy

or

Final energy = 25% of the energy without dielectric

therefore,

hence, the energy loss fraction is (\frac{100-25}{100})=\frac{3}{4}

c) Now,

removing half way out the dielectric

thus,

k' = k/2

or

k' = 4/2 = 2

and no charge escape

thus,

12C = k'\times C\times V'

or

V' =  \frac{12}{2}

or

V' = 6 volts

therefore,

the voltmeter will read 6 volts

You might be interested in
If a group of workers can apply a force of 1000 newtons to move a crate 20.0 meters on a frictionless ramp: How high up a ramp w
Oksi-84 [34.3K]
That's going to depend on the mass of the crate. They'll be able to push a crate full of pingpong balls really high, but they may not be able to even budge the crate at all if it's full of bricks.
8 0
3 years ago
Luke and Carrie are driving down a straight section of the interstate at 70 mph in Luke's new convertible. Carrie is drinking a
aleksandrvk [35]
I think is c am sorry if it is rongh
3 0
3 years ago
Read 2 more answers
LINK OR PDF = REPORT
seraphim [82]

C

Explanation:

that's just what I learned in school

3 0
2 years ago
Read 2 more answers
If you fall from a building onto a net which extends the time of impact by 10 times, what happens to the force you experience?
zubka84 [21]

Answer:

A larger impulse. A 1-kg ball has twice as much speed as a 10-kg ball.

Explanation:

6 0
2 years ago
An assault rifle fires an eight-shot burst in 0.40 s. Each bullet has a mass of 7.5 g and a speed of 300 m/s as it leaves the gu
myrzilka [38]

Answer:

The average recoil force on the gun during that 0.40 s burst is 45 N.

Explanation:

Mass of each bullet, m = 7.5 g = 0.0075 kg

Speed of the bullet, v = 300 m/s

Time, t = 0.4 s

The change in momentum of an object is equal to impulse delivered. So,

F\times t=mv\\\\F=\dfrac{mv}{t}

For 8 shot burst, average recoil force on the gun is :

F=\dfrac{8mv}{t}\\\\F=\dfrac{7.5}{1000}\cdot\dfrac{300}{0.4}\cdot8\\\\F=45\ N

So, the average recoil force on the gun during that 0.40 s burst is 45 N.

5 0
2 years ago
Other questions:
  • 6x+y=6 <br> 8x-2y=-1 <br><br> con solución de sistemas de ecuaciones por favor
    7·1 answer
  • An initially motionless test car is accelerated uniformly to 115 km/h in 8.83 seconds before striking a simulated deer. The car
    8·1 answer
  • Humid air breaks down (its molecules become ionized) in an electric field of 4.99 x 10^6 N/C. In that field, what is the magnitu
    11·1 answer
  • A student stands on a bathroom scale in an elevator at rest on the 64th floor of a building. The scale reads 839 N. As the eleva
    8·1 answer
  • Jasmine leaves her house to go for a run. She isn't paying attention to where
    12·1 answer
  • A bugle can be thought of as an open pipe. If a bugle were straightened out, it would be 2.65 mlong.a.) If the speed of sound is
    5·1 answer
  • HELPPPPPPPPPPPPPPPPPP OMGGGGGGGGGGGGGGGGGGGGGGG
    9·1 answer
  • What is the kinetic energy of a ball with a mass of 9 kg and a velocity of 13 m/s ?
    5·1 answer
  • One gallon of paint covers an area of 25 m2. What is the thickness of the paint on the wall?​
    6·1 answer
  • If an object has a mass of 4 kg and an acceleration of 8 m/s2, what is the force this object exerts?
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!