Answer
64.8k+ views
Hint: For the motion of a charged particle in a magnetic field, the magnetic field vector $B$, the velocity of the particle vector $v$, and the magnetic force vector $F$ that exerted on the particle are all perpendicular to each other.
Complete answer:
The right-hand rule of Fleming states that, to find the direction of the magnetic force on a positive charge, the thumb of the right-hand point in the direction of the velocity of the particle $v$, the fingers in the direction of the magnetic field ($B$), and the force ($F$) is directed perpendicular to the right-hand palm.
![](https://www.vedantu.com/question-sets/7da8242c-8b5b-4eac-a738-e67612d9f94a7614470685517999356.png)
The magnetic force on a charged particle with positive charge $q$ moving in a magnetic field $B$ with a velocity $v$ (at angle $\theta $ to $B$) is –
\[\overrightarrow F = qvB\sin \theta \]
\[ \Rightarrow \overrightarrow F = q(\overrightarrow v \times \overrightarrow B )\]
Therefore we can say, force is the cross product of $B$ and $v$ and hence Force is in the perpendicular plane of velocity and magnetic field.
Hence In the figure,
![](https://www.vedantu.com/question-sets/0a15281e-f71f-480c-9733-ba2c85574b374238823434039848698.png)
the direction of the magnetic field and force are given. Now if we apply Fleming right-hand rule the direction of the particle velocity will be into the plane of the page.
Hence, the option (E) is the correct answer.
Note: Fleming's rules are applied for determining the relation between the directions of magnetic field, electric current and velocity of a conductor.
There are two rules,
Fleming's left-hand rule for motors which applies for an electric current induces motion in the conductor in the presence of magnetic fields known as Lorentz force.
Fleming's right-hand rule for generators, which applies for a conductor moving through a magnetic field, has an electromotive force induced in it as a result known as Faraday's law of induction.
Complete answer:
The right-hand rule of Fleming states that, to find the direction of the magnetic force on a positive charge, the thumb of the right-hand point in the direction of the velocity of the particle $v$, the fingers in the direction of the magnetic field ($B$), and the force ($F$) is directed perpendicular to the right-hand palm.
![](https://www.vedantu.com/question-sets/7da8242c-8b5b-4eac-a738-e67612d9f94a7614470685517999356.png)
The magnetic force on a charged particle with positive charge $q$ moving in a magnetic field $B$ with a velocity $v$ (at angle $\theta $ to $B$) is –
\[\overrightarrow F = qvB\sin \theta \]
\[ \Rightarrow \overrightarrow F = q(\overrightarrow v \times \overrightarrow B )\]
Therefore we can say, force is the cross product of $B$ and $v$ and hence Force is in the perpendicular plane of velocity and magnetic field.
Hence In the figure,
![](https://www.vedantu.com/question-sets/0a15281e-f71f-480c-9733-ba2c85574b374238823434039848698.png)
the direction of the magnetic field and force are given. Now if we apply Fleming right-hand rule the direction of the particle velocity will be into the plane of the page.
Hence, the option (E) is the correct answer.
Note: Fleming's rules are applied for determining the relation between the directions of magnetic field, electric current and velocity of a conductor.
There are two rules,
Fleming's left-hand rule for motors which applies for an electric current induces motion in the conductor in the presence of magnetic fields known as Lorentz force.
Fleming's right-hand rule for generators, which applies for a conductor moving through a magnetic field, has an electromotive force induced in it as a result known as Faraday's law of induction.
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