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
oksano4ka [1.4K]
3 years ago
9

A beam contains 4.9 × 108 doubly charged positive ions per cubic centimeter, all of which are moving north with a speed of 4.6 ×

105 m/s. What is (a) the magnitude of the current density and (b) direction of the current density (c) what additional quantity do you need to calculate the total current i in this ion beam?
Physics
1 answer:
Bumek [7]3 years ago
8 0

Answer:

72.12\ \text{A/m}^2

south

cross sectional area of the beam

Explanation:

v = Velocity of ions = 4.6\times 10^5\ \text{m/s}

Number of ions per \text{cm}^3 = 4.9\times 10^8

Charge density would be the product of number of ions per cm^3 and the charge of electrons multiplied by 2 as they are doubly charged.

\rho_q=4.9\times 10^8\times 10^6\times 2\times 1.6\times 10^{-19}\\\Rightarrow \rho_q=0.0001568\ \text{C/m}^3

Current density is given by

J=\rho_qv\\\Rightarrow J=0.0001568\times 4.6\times 10^5\\\Rightarrow J=72.12\ \text{A/m}^2

The current density is 72.12\ \text{A/m}^2

The direction of the current density is opposite to the movement of the charged particle. The particles are moving north so the direction of current density will be to the south.

Current is given by

I=JA

where A is the cross sectional area of the beam .

So the cross sectional area of the beam is required to determine the total current in this ion beam.

You might be interested in
Examples for inertia
Lerok [7]

One's body movement to the side when a car makes a sharp turn.

Tightening of seat belts in a car when it stops quickly.

A ball rolling down a hill will continue to roll unless friction or another force stops it.

Men in space find it more difficult to stop moving because of a lack of gravity acting against them.

6 0
4 years ago
An explanation can be consistent but may not be the best explanation for a phenomenon
notka56 [123]

Answer:

true

Explanation:

8 0
3 years ago
Read 2 more answers
Classify:Energyis the ability to exert force and cause change. Energy has manyforms:
Grace [21]

Answer:

Energy: Kinetic, Sound, Thermal, gravitational, electric, light and nuclear

Explanation:

This exercise asks to clarify a little some important concepts

* Energy. It is the capable one that has the bodies to carry out a job.

* Kinetic energy. It is the energy due to the movement of objects

* sound energy. It is the energy due to the vibration of the atoms or molecules of the materials, it can be solid, liquid or gaseous

* Thermal energy. It is the energy due to movement of the particles

* Gravitational Energy. It is a configuration energy due to the height of the bodies with respect to a reference point

* Electric power. It is due to the movement of electric charges

* light energy. It is the energy that light carries due to the electric and magnetic fields that form it, it occurs throughout the electromagnetic spectrum

* Nuclear energy. It is the energy stored in the nucleus by the configuration and movement of protons and neutrons.

6 0
3 years ago
Why should flexibility exercises be done in conjunction with strength-building exercises?
bixtya [17]
<span>Flexibility exercises should be done in conjunction with strength-building exercises because: 

</span><span>They work together to maintain your overall level of fitness.
</span>
I hope my answer has come to your help. God bless and have a nice day ahead!
7 0
4 years ago
Read 2 more answers
4. There is a flashing yellow light at the intersection you are approaching. What does the flashing yellow light indicate, and w
OleMash [197]
It indicates that you should proceed with caution. You should slow down and be prepared to stop to safely navigate this intersection.  
4 0
4 years ago
Other questions:
  • 1. A 930-kg car traveling 56 km/h comes to a complete stop in 2.0 s. What is the
    13·1 answer
  • You apply 100.0 N of force to a machine. The machine applies 20.0 N of force to the load. What is the mechanical advantage of th
    6·2 answers
  • Tidal forces are gravitational forces exerted on different parts of a body by a second body. Their effects are particularly visi
    5·1 answer
  • How did newton use creativity and logic in his approach to investigating light?
    7·2 answers
  • A comet is traveling through space with speed 3.01 ✕ 104 m/s when it encounters an asteroid that was at rest. The comet and the
    8·1 answer
  • When a 0.350-kg package is attached to a vertical spring and lowered slowly, the spring stretches 12.0 cm. The package is now di
    14·1 answer
  • _C7H16+ _O2 produces _CO2 +H2O
    11·1 answer
  • A 100 kg man jumps into a swimming pool from a height of 5.0 meters. It takes 0.40 seconds for the water to reduce his velocity
    9·1 answer
  • Which of the following would INCREASE the circuit's resistance?
    15·1 answer
  • Does anyone just ever question their gender. But you get scared out of wanting and feeling like the opposite gender.
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!