Which of the following graphs correctly represents the variation of magnetic field induction with distance due to a thin wire carrying current?

1. 2.
3. 4.

Subtopic:  Magnetic Field due to various cases |
 80%
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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%
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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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What is the magnetic dipole moment of the given loop?

                 

1. \({ 5 \over 2} \pi R^2I\) 2. \(3 \pi R^2I\)
3. \({ 3 \over 2} \pi R^2I\) 4. \(5 \pi R^2I\)
Subtopic:  Magnetic Moment |
 53%
From NCERT
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The magnetic field at center due to the orbital motion of the electron in the hydrogen atom is :

1.  12.5 tesla

2.  5 tesla

3.  24 tesla

4.  1 tesla

Subtopic:  Magnetic Field due to various cases |
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%
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A galvanometer of resistance 240 Ω allows only 4% of the main current after connecting a shunt resistance. What is the value of shunt resistance?

1.  10 Ω

2.  20 Ω

3.  8 Ω

4.  5 Ω

Subtopic:  Conversion to Ammeter & Voltmeter |
 75%
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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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