A current-carrying closed Loop in the form of a right isosceles triangle ABC is placed in xy plane in a uniform magnetic field acting along the y-axis as shown in the figure. If the magnetic force on the arm AC is F, then force on the arm BC and AB are respectively

(1) zero, zero

(2) -F and zero

(3) F and -F

(4) F and zero

Subtopic:  Lorentz Force |
 58%
From NCERT
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A uniform electric field and a uniform magnetic field are acting in the same direction in a certain region. If a proton is projected in this region such that its velocity is pointed along the direction of fields, then the proton :

1.  will turn towards the left of the direction of motion

2.  will turn towards the right of the direction of motion

3.  will speed up

4.  will slow down

 

Subtopic:  Lorentz Force |
 67%
From NCERT
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When a proton is released from rest in a room, it starts with an initial acceleration a0 towards the east. When it is projected towards the north with a speed v0, it moves with initial acceleration 3a0 towards east. The electric and magnetic fields in the room are -

1.  Ma0ewest, Ma0ev0up

2.  Ma0ewest, 2Ma0ev0down

3.  Ma0eeast, 2Ma0ev0down

4.  Ma0eeast, 2Ma0ev0up

Subtopic:  Lorentz Force |
From NCERT
AIPMT - 2013
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When an electron enters perpendicularly in a magnetic field with velocity v, time period of its revolution is T. If it enters in the same magnetic field with a velocity 2v, then its time period will be:

1.  2T

2.  4T

3.  T2

4.   T

Subtopic:  Lorentz Force |
 71%
From NCERT
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A positively charged particle descends vertically. In which direction will the horizontal component of the earth's magnetic field deflect?

1. east

2. west

3. north

4. south

Subtopic:  Lorentz Force |
From NCERT
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The figure shows a particle of charge q and mass m moving with velocity v along the x-axis enters a region of the uniform magnetic field. The minimum value of v so that the charge q is deflected by an angle 30° is

                                       

1.  2qBb - am 

2.  qBb + a2m 

3.  qBb - am 

4.  qBb2m

Subtopic:  Lorentz Force |
 53%
From NCERT
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An electron is traveling along the x-direction. It encounters a magnetic field in the y-direction. Its subsequent motion will be:

1.  Straight-line along the x-direction

2.  A circle in the xz-plane

3.  A circle in the yz-plane

4.  A circle in the xy-plane

 

Subtopic:  Lorentz Force |
From NCERT
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The dots in the figure depict a magnetic field that is perpendicular to the plane of the paper and emanates from it. The trajectory of a particle in the plane of the paper is depicted by the curve ABC. What exactly is the particle?

                           

1. Proton. 2. Electron.
3. Neutron. 4. It cannot be predicted.
Subtopic:  Lorentz Force |
 59%
From NCERT
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The electric charge in uniform motion produces :

(1) An electric field only

(2) A magnetic field only

(3) Both electric and magnetic field

(4) Neither electric nor magnetic field

Subtopic:  Lorentz Force |
 78%
From NCERT
PMT - 1971
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An electron and a proton enter a magnetic field perpendicularly. Both have the same kinetic energy. Which of the following is true:

1. Trajectory of electron is less curved

2. Trajectory of proton is less curved

3. Both trajectories are equally curved

4. Both move on a straight-line path

Subtopic:  Lorentz Force |
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