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
il63 [147K]
3 years ago
6

What is the velocity of a beam of electrons that goes undeflected when moving perpendicular to an electric and magnetic fields.

E--> and B--> are also perpendicular to each other and have magnitudes 7900V/m and 9.1*10^-3T , respectively.
What is the radius of the electron orbit if the electric field is turned off?
Physics
1 answer:
Charra [1.4K]3 years ago
3 0

Explanation:

Given that,

Electric field, E = 7900 V/m

Magnetic field, B=9.1\times 10^{-3}\ T

(a) Let v is the velocity of a beam of electrons that goes undeflected when moving perpendicular to an electric and magnetic fields. The magnitude of electric force and the magnetic force balance each other as :

qE=qvB

v=\dfrac{E}{B}

v=\dfrac{7900\ V/m}{9.1\times 10^{-3}\ T}

v=8.68\times 10^5\ m/s

(b) Let r is the radius of the electron orbit. The radius of the motion of electron is given by :

r=\dfrac{mv}{qB}

r=\dfrac{9.1\times 10^{-31}\ kg\times 8.68\times 10^5\ m/s}{1.6\times 10^{-19}\ C\times 9.1\times 10^{-3}\ T}

r=5.4\times 10^{-4}\ m

Hence, this is the required solution.

You might be interested in
what is the average gravitational force of attraction between the earth and the sun? the earth averages a distance of about 150
Tanzania [10]

Answer:

B

Explanation:

Hhhhh

5 0
2 years ago
MATCH THESE ^-^ Match Newton's law with the correct statement.
ikadub [295]
1 and A
2 and B
3 and D
4 and C

4 0
3 years ago
Read 2 more answers
PLEASE HELPPPPP
Ganezh [65]

The only graph that accurately depict the given motion is graph D.

The given parameters;

  • initial position of the man = 0
  • direction of the man's first displacement = backward
  • time of first motion, t₁ = 6 seconds
  • velocity of this first displacement = v₁
  • time without any motion (<em>zero movement</em>) = 6 seconds
  • direction of the second displacement = forward
  • velocity of second displacement = 2v₁

Let the acceleration of the first displacement = a

Acceleration of the second displacement = 2a

From the given graphs we can eliminate every graph without initial decrease or motion towards the negative direction.

The only options with initial motion towards the negative direction are;

  • <em>graph B</em>, and
  • <em>graph D</em>.

The difference between graph B and D;

  • in graph B there is a uniform motion for 6 seconds
  • in graph D there is no motion for 6 seconds (<em>this is obvious as the line fall directly on top of the horizontal axis maintaining a value of zero for 6 seconds</em>).

Thus, the only graph that accurately depict the given motion is graph D.

Learn more here: brainly.com/question/21095906

5 0
2 years ago
An object at rest cannot remain at rest unless which of the following holds?View Available Hint(s)An object at rest cannot remai
Leni [432]

Answer:

True The net force must be zero for the acceleration to be zero

Explanation:

In order to analyze the statements of this problem we propose your solution.

First let's look at Newton's first, which stable that every object is at rest or with constant speed unless something takes it out of this state (acceleration)

Now let's look at the second postulate, which says that force is related to the product of the mass of a body and its acceleration.

As a result of these two laws, for a body is a constant velocity the summation force on it must be zero.

Now we can analyze the statements given.

True The net force must be zero for the acceleration to be zero

False. If the force is different from zero, there is acceleration that changes the speeds

False. There may be forces, but the sum of them must be zero

False. If a force acts, the acceleration is different from zero and the speed changes

5 0
2 years ago
Whats is the resistance of a bulb with a current of 60a in a circuit with a 12v battery
lara [203]

Answer:

60a in a circuit with a 12v battery

Explanation:

60a in a circuit with a 12v battery

6 0
2 years ago
Other questions:
  • How does an object move when it is subject to a steady centripetal force
    10·1 answer
  • A cylindrical rod 21.5 cm long with a mass of 1.20 kg and a radius of 1.50 cm has a ball of diameter of 6.90 cm and a mass of 2.
    15·1 answer
  • A wire 2.80 m in length carries a current of 5.20 A in a region where a uniform magnetic field has a magnitude of 0.430 T. Calcu
    10·1 answer
  • The distance traveled by a wave during a single period is
    8·1 answer
  • If a ball is thrown straight up, where is its acceleration the<br> greatest
    15·1 answer
  • A strontium vapor laser beam is reflected from the surface of a CD onto a wall. The brightest spot is the reflected beam at an a
    6·1 answer
  • A 0.48 kg circus monkey is about to be shot from a cannon as part of his thrilling circus act. Draw a free body diagram labeling
    14·1 answer
  • An ordinary ruler is used to measure the area and its error of a rectangle. It is found that their sides are 5.0 cm long and 2.0
    13·1 answer
  • Mass is the amount of matter in an object what describes the amount of space the object takes up?
    10·1 answer
  • the velocity of an object is given v(t), and the acceleration is given by a(t). what is the relationship between the total
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!