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%
From NCERT
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The unit of reduction factor of the tangent galvanometer is 

(1) Ampere

(2) Gauss

(3) Radian

(4) None of these

Subtopic:  Moving Coil Galvanometer |
PMT - 1987
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A galvanometer of \(50~\Omega \) resistance has 25 divisions. A current of 4 × 10–4 A gives a deflection of one division. To convert this galvanometer into a voltmeter having a range of 25 V, it should be connected with a resistance of:

1. 2500 Ω as a shunt

2. 2450 Ω as a shunt

3. 2550 Ω in series

4. 2450 Ω in series

Subtopic:  Moving Coil Galvanometer |
 65%
From NCERT
PMT - 2004
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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%
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 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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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 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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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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