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%
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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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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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A closed-loop (of any shape) carrying current lies in the x-y plane. What happens when a uniform magnetic field B is present in the region such that the loop experiences zero force?

1. B acts along the x-axis
2. B acts along the y-axis
3. B acts along the z-axis
4. B can act along any of the above direction for the net force to be zero

Subtopic:  Current Carrying Loop: Force & Torque |
 55%
From NCERT
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A circular loop with a radius of 20 cm is placed in a uniform magnetic field B = 2T in the XY plane as shown in the figure. If the loop carries a current of i = 1 A, then the magnitude of torque acting on the loop will be:
       
1.  0.25 N-m

2.  5.2 N-m

3.  2.5 N-m

4.  0.52 N-m

Subtopic:  Current Carrying Loop: Force & Torque |
 70%
From NCERT
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A circular coil of wire of radius 'r' has 'n' turns and carries a current 'I'. The magnetic induction (B) at a point on the axis of the coil at a distance 3r from its center is :

1.  μ0In4r 

2.  μ0In8r 

3.  μ0In16r 

4.  μ0In32r 

Subtopic:  Magnetic Field due to various cases |
 62%
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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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If an electron of velocity 2i^ + 3j^ is subjected to a magnetic field of \(4\hat{\mathrm{k}}\) :

1. the speed will change.
2. the direction will change.
3. both (1) and (2)
4. none of the above

Subtopic:  Lorentz Force |
 57%
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