Tag: fleming's left hand rule

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Questions Related to fleming's left hand rule

Multiple choice physics magnetic effect of electric current fleming's left hand rule magnetic force magnetic force on a moving charge and current carrying wire

An electron having a charge e moves with a velocity v in X-direction. A magnetic field acts on it in Y-direction. The force on the electron acts in

  1. positive direction of Y-axis

  2. negative direction of Y-axis

  3. positive direction of Z-axis

  4. negative direction of Z-axis
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
As electron moving in positive x-direction, so the current  is moving in negative x-direction ( the direction of your middle finger) and the magnetic field acts on positive Y-direction ( the direction of your index finger) then thumb will be in negative Z-direction which is the direction of force. 
Multiple choice physics magnetic effect of electric current fleming's left hand rule magnetic force magnetic force on a moving charge and current carrying wire

A positively charged particle falls vertically downwards. The horizontal component of earths magnetic field will deflect it towards

  1. West

  2. East

  3. South

  4. North
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Using Fleming's left-hand rule, the force on a positive charge is F = q(v x B). With velocity downwards and the horizontal magnetic field component pointing North, the cross product results in a force directed towards the East.

Multiple choice physics magnetic effect of electric current fleming's left hand rule magnetic force magnetic force on a moving charge and current carrying wire

You are sitting in a room in which a strong magnetic field is directed from your left towards right. A beam of electrons is directed from front towards you. What would be the direction of magnetic force on this beam ?

  1. downwards.

  2. upwards.

  3. towards right

  4. towards left

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The direction of the magnetic field is from left to right, the direction of the beam of electrons is from your front hence the direction of the current is from back to front. Now by applying Fleming left hand rule we can find that the direction of the magnetic force on the beam of electron is downwards.
Multiple choice physics magnetic effect of electric current fleming's left hand rule magnetic force magnetic force on a moving charge and current carrying wire

An electron is travelling along the x-direction. It encounters a magnetic field in the ydirection. Its subsequent motion will be

  1. straight line along the x-direction

  2. a circle in the zx-plane

  3. a circle in the yz-plane

  4. a circle in the xy-plane
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The magnetic force acting on a charged particle is given by 

$\vec{F}=q(\vec{v}\times \vec{B})$
Hence direction of force acting one electron is $\hat{i}\times \hat{j}=\hat{k}$
The force experienced is in z-direction. So the particle moves in the zx plane.

Multiple choice physics magnetic effect of electric current fleming's left hand rule magnetic force magnetic force on a moving charge and current carrying wire

An electric current runs counterclockwise in a rectangular loop around the outside edge of the page which lies flat on your table. A uniform magnetic field is then turned on directed parallel to the page from the top to bottom. The magnetic force on the page will cause:

  1. the left edge to lift up

  2. the right edge to lift up

  3. the top edge to lift up

  4. the bottom edge to lift up
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Current is flowing anticlockwise in the rectangular loop and in the upper edge of page current is flowing towards left and magnetic field is from top to bottom , so by applying Fleming's left hand rule the direction of force is found to be in the upward direction, lifting the top edge up.

Multiple choice physics magnetic effect of electric current fleming's left hand rule magnetic force magnetic force on a moving charge and current carrying wire

A positive charge is at rest in a uniform magnetic field directed to the right. What force does the positive charge feel, due to the magnetic field?

  1. An upward force.

  2. A downward force.

  3. A force to the left.

  4. No force is felt.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
For experiencing a magnetic force on a charge  particle, the particle should move in the magnetic field with some velocity. As the velocity of the particle is zero so, the force on the particle is also zero.
Multiple choice physics magnetic effect of electric current fleming's left hand rule magnetic force magnetic force on a moving charge and current carrying wire

The direction of force on a current carrying conductor placed in a magnetic field is given by :

  1. Fleming's Left Hand Rule

  2. Fleming's Right Hand Rule

  3. End Rule

  4. Right Hand Palm Rule
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The direction of this force is always right angles to the plane containing both the conductor and the magnetic field, and is predicted by Fleming’s Left-Hand Rule.

Multiple choice physics magnetic effect of electric current fleming's left hand rule magnetic force magnetic force on a moving charge and current carrying wire

A vertical wire carries a current in upward direction. An electron beam sent horizontally towards the wire will be deflected (gravity free space) :

  1. towards right

  2. towards left

  3. upwards

  4. downwards
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

$F= q(\vec{v} \times \vec{B})= (-e)( -v\hat{i}\times (-B\hat{k}))=evB\hat{j}$
Thus, force on the electron beam is along the +ve y-axis.

Multiple choice physics magnetic fields and electromagnetism fleming's left hand rule magnetic force magnetic force on a moving charge and current carrying wire

In _______ Fleming Left hand rule is not used.

  1. Electric fan

  2. Mixer

  3. Computer

  4. Electric generator
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Fleming's left-hand rule is used for electric motors, which convert electrical energy into mechanical energy. An electric generator uses Fleming's right-hand rule, as it converts mechanical energy into electrical energy.

Multiple choice physics magnetic fields and electromagnetism fleming's left hand rule magnetic force magnetic force on a moving charge and current carrying wire

Fleming's left hand rule is used to find

  1. Direction of magnetic field

  2. Direction of current

  3. Direction of magnetic force acting on conductor

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Fleming's left hand rule states that if the thumb, forefinger, and middle finger of the left hand are mutually perpendicular, the forefinger points in the direction of the magnetic field, the middle finger in the direction of current, and the thumb points in the direction of the magnetic force acting on the conductor.