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A uniform electric field and uniform magnetic field are acting along the same direction in a certain region. If an electron is projected in the region such that its velocity is pointed along the direction of fields, then the electron
- a)will turn towards right of direction of motion
- b)speed will decrease
- c)speed will increase
- d)will turn towards left direction of motion
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
A uniform electric field and uniform magnetic field are acting along t...
and 
are in same direction so th at magnetic force on electron becomes zero, only electric force acts. But force on electron due to electric field is opposite to the direction of velocity.Most Upvoted Answer
A uniform electric field and uniform magnetic field are acting along t...
Explanation:
Force on an electron in an electric field:
- In an electric field, the force experienced by an electron is given by the equation F = qE, where q is the charge of the electron and E is the electric field strength.
- Since the electron is negatively charged, it will experience a force in the direction opposite to the electric field.
Force on an electron in a magnetic field:
- In a magnetic field, the force experienced by an electron is given by the equation F = qvB, where v is the velocity of the electron and B is the magnetic field strength.
- The direction of the force is perpendicular to both the velocity of the electron and the magnetic field.
Combined effect:
- When an electron is projected in a region where both an electric field and a magnetic field are acting along the same direction, the forces due to the electric and magnetic fields will act in opposite directions.
- The electric field will try to decelerate the electron, while the magnetic field will cause the electron to move in a circular path.
- As a result, the speed of the electron will decrease as it moves in a circular path due to the combined effect of the electric and magnetic fields.
Therefore, the correct answer is option 'B' - speed will decrease.
Force on an electron in an electric field:
- In an electric field, the force experienced by an electron is given by the equation F = qE, where q is the charge of the electron and E is the electric field strength.
- Since the electron is negatively charged, it will experience a force in the direction opposite to the electric field.
Force on an electron in a magnetic field:
- In a magnetic field, the force experienced by an electron is given by the equation F = qvB, where v is the velocity of the electron and B is the magnetic field strength.
- The direction of the force is perpendicular to both the velocity of the electron and the magnetic field.
Combined effect:
- When an electron is projected in a region where both an electric field and a magnetic field are acting along the same direction, the forces due to the electric and magnetic fields will act in opposite directions.
- The electric field will try to decelerate the electron, while the magnetic field will cause the electron to move in a circular path.
- As a result, the speed of the electron will decrease as it moves in a circular path due to the combined effect of the electric and magnetic fields.
Therefore, the correct answer is option 'B' - speed will decrease.
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A uniform electric field and uniform magnetic field are acting along the same direction in a certain region. If an electron is projected in the region such that its velocity is pointed along the direction of fields, then the electrona)will turn towards right of direction of motionb)speed will decreasec)speed will increased)will turn towards left direction of motionCorrect answer is option 'B'. Can you explain this answer?
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A uniform electric field and uniform magnetic field are acting along the same direction in a certain region. If an electron is projected in the region such that its velocity is pointed along the direction of fields, then the electrona)will turn towards right of direction of motionb)speed will decreasec)speed will increased)will turn towards left direction of motionCorrect answer is option 'B'. Can you explain this answer? for JEE 2024 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about A uniform electric field and uniform magnetic field are acting along the same direction in a certain region. If an electron is projected in the region such that its velocity is pointed along the direction of fields, then the electrona)will turn towards right of direction of motionb)speed will decreasec)speed will increased)will turn towards left direction of motionCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for JEE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A uniform electric field and uniform magnetic field are acting along the same direction in a certain region. If an electron is projected in the region such that its velocity is pointed along the direction of fields, then the electrona)will turn towards right of direction of motionb)speed will decreasec)speed will increased)will turn towards left direction of motionCorrect answer is option 'B'. Can you explain this answer?.
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