Class 12 Exam > Class 12 Questions > An electron is moving along positive x-axis. ...
Start Learning for Free
An electron is moving along positive x-axis. A uniform electric field exists towards negative y-axis. What should be the direction of magnetic field of suitable magnitude so that net force of electron is zero.
- a)Positive z-axis
- b)Negative z-axis
- c)Positive y-axis
- d)Negative y-axis
Correct answer is option 'B'. Can you explain this answer?
| FREE This question is part of | Download PDF Attempt this Test |
Verified Answer
An electron is moving along positive x-axis. A uniform electric field ...
Let the velocity of the electron is v
Then
If the electric field is E then
Lorentz Force
or, 
For force to be zero
or, 
To get the RHS in the direction of 
, B should be acting in the direction of 
. As we know that 
Therefore the direction of the magnetic field must be in the negative z-axis.
Most Upvoted Answer
An electron is moving along positive x-axis. A uniform electric field ...
Explanation:
To find the direction of the magnetic field that will result in a net force of zero on the electron, we can use the right-hand rule for the cross product of the electric and magnetic fields. According to this rule, the direction of the magnetic field can be determined by placing the fingers of the right hand in the direction of the electric field and then curling them towards the magnetic field.
Given:
Electric field direction: towards negative y-axis
Electron's motion: along positive x-axis
Step 1: Determine the direction of the electric field
The electric field is given to be towards the negative y-axis. This means that the electric field vector points downwards in the y-axis direction.
Step 2: Determine the direction of the electron's velocity
The electron is moving along the positive x-axis. This means that the velocity vector of the electron points towards the positive x-axis direction.
Step 3: Apply the right-hand rule
To find the direction of the magnetic field, we need to curl the fingers of the right hand from the direction of the electric field (downwards) towards the direction of the electron's velocity (positive x-axis).
Result:
Using the right-hand rule, we find that the magnetic field direction is perpendicular to both the electric field and the velocity of the electron. The resulting magnetic field direction is along the negative z-axis (out of the page). Therefore, the correct answer is option 'B' - Negative z-axis.
To find the direction of the magnetic field that will result in a net force of zero on the electron, we can use the right-hand rule for the cross product of the electric and magnetic fields. According to this rule, the direction of the magnetic field can be determined by placing the fingers of the right hand in the direction of the electric field and then curling them towards the magnetic field.
Given:
Electric field direction: towards negative y-axis
Electron's motion: along positive x-axis
Step 1: Determine the direction of the electric field
The electric field is given to be towards the negative y-axis. This means that the electric field vector points downwards in the y-axis direction.
Step 2: Determine the direction of the electron's velocity
The electron is moving along the positive x-axis. This means that the velocity vector of the electron points towards the positive x-axis direction.
Step 3: Apply the right-hand rule
To find the direction of the magnetic field, we need to curl the fingers of the right hand from the direction of the electric field (downwards) towards the direction of the electron's velocity (positive x-axis).
Result:
Using the right-hand rule, we find that the magnetic field direction is perpendicular to both the electric field and the velocity of the electron. The resulting magnetic field direction is along the negative z-axis (out of the page). Therefore, the correct answer is option 'B' - Negative z-axis.
Free Test
FREE
| Start Free Test |
Community Answer
An electron is moving along positive x-axis. A uniform electric field ...
Negative zDue to electric field force is in positive y directonfor net force zero on electron force due to magnetic field must be in negative y direction direction of magnetic field is in negative z direction
|
Explore Courses for Class 12 exam
|
|
Similar Class 12 Doubts
An electron is moving along positive x-axis. A uniform electric field exists towards negative y-axis. What should be the direction of magnetic field of suitable magnitude so that net force of electron is zero.a)Positive z-axisb)Negative z-axisc)Positive y-axisd)Negative y-axisCorrect answer is option 'B'. Can you explain this answer?
Question Description
An electron is moving along positive x-axis. A uniform electric field exists towards negative y-axis. What should be the direction of magnetic field of suitable magnitude so that net force of electron is zero.a)Positive z-axisb)Negative z-axisc)Positive y-axisd)Negative y-axisCorrect answer is option 'B'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about An electron is moving along positive x-axis. A uniform electric field exists towards negative y-axis. What should be the direction of magnetic field of suitable magnitude so that net force of electron is zero.a)Positive z-axisb)Negative z-axisc)Positive y-axisd)Negative y-axisCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for An electron is moving along positive x-axis. A uniform electric field exists towards negative y-axis. What should be the direction of magnetic field of suitable magnitude so that net force of electron is zero.a)Positive z-axisb)Negative z-axisc)Positive y-axisd)Negative y-axisCorrect answer is option 'B'. Can you explain this answer?.
An electron is moving along positive x-axis. A uniform electric field exists towards negative y-axis. What should be the direction of magnetic field of suitable magnitude so that net force of electron is zero.a)Positive z-axisb)Negative z-axisc)Positive y-axisd)Negative y-axisCorrect answer is option 'B'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about An electron is moving along positive x-axis. A uniform electric field exists towards negative y-axis. What should be the direction of magnetic field of suitable magnitude so that net force of electron is zero.a)Positive z-axisb)Negative z-axisc)Positive y-axisd)Negative y-axisCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for An electron is moving along positive x-axis. A uniform electric field exists towards negative y-axis. What should be the direction of magnetic field of suitable magnitude so that net force of electron is zero.a)Positive z-axisb)Negative z-axisc)Positive y-axisd)Negative y-axisCorrect answer is option 'B'. Can you explain this answer?.
Solutions for An electron is moving along positive x-axis. A uniform electric field exists towards negative y-axis. What should be the direction of magnetic field of suitable magnitude so that net force of electron is zero.a)Positive z-axisb)Negative z-axisc)Positive y-axisd)Negative y-axisCorrect answer is option 'B'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 12.
Download more important topics, notes, lectures and mock test series for Class 12 Exam by signing up for free.
Here you can find the meaning of An electron is moving along positive x-axis. A uniform electric field exists towards negative y-axis. What should be the direction of magnetic field of suitable magnitude so that net force of electron is zero.a)Positive z-axisb)Negative z-axisc)Positive y-axisd)Negative y-axisCorrect answer is option 'B'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
An electron is moving along positive x-axis. A uniform electric field exists towards negative y-axis. What should be the direction of magnetic field of suitable magnitude so that net force of electron is zero.a)Positive z-axisb)Negative z-axisc)Positive y-axisd)Negative y-axisCorrect answer is option 'B'. Can you explain this answer?, a detailed solution for An electron is moving along positive x-axis. A uniform electric field exists towards negative y-axis. What should be the direction of magnetic field of suitable magnitude so that net force of electron is zero.a)Positive z-axisb)Negative z-axisc)Positive y-axisd)Negative y-axisCorrect answer is option 'B'. Can you explain this answer? has been provided alongside types of An electron is moving along positive x-axis. A uniform electric field exists towards negative y-axis. What should be the direction of magnetic field of suitable magnitude so that net force of electron is zero.a)Positive z-axisb)Negative z-axisc)Positive y-axisd)Negative y-axisCorrect answer is option 'B'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice An electron is moving along positive x-axis. A uniform electric field exists towards negative y-axis. What should be the direction of magnetic field of suitable magnitude so that net force of electron is zero.a)Positive z-axisb)Negative z-axisc)Positive y-axisd)Negative y-axisCorrect answer is option 'B'. Can you explain this answer? tests, examples and also practice Class 12 tests.
|
|
Explore Courses for Class 12 exam
|
|
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
Follow Us
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup