The maximum kinetic energy of the positive ion of charge q and mass m in the cyclotron of radius \(r_o\) in which applied magnetic field is B, is:

1. q2Br02m                        

2. qB2r02m

3. q2B2r022m                        

4. qBr02m2

Subtopic:  Cyclotron (OLD NCERT) |
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Cyclotron cannot be used to accelerate

(1) Electrons                       

(2) Neutrons

(3) Positive ions                   

(4) Both (1) and (2)

Subtopic:  Cyclotron (OLD NCERT) |
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 A charge is moving in a circular path of radius 'r' with speed v in a transverse magnetic field B. Specific charge of the particle is

1. vBr

2. Bvr

3. Bvr

4. vrB

Subtopic:  Cyclotron (OLD NCERT) |
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An α-particle completes 40,000 revolutions in a cyclotron before exiting from it. If potential difference between the Dees is 5000 V, then the energy gained by the particle is

1. 8 MeV

2. 800 MeV

3. 4 MeV

4. 400 MeV 

Subtopic:  Cyclotron (OLD NCERT) |
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To compensate the relativistic variation of mass at high speed of charge in cyclotron. Adjustments can be made is :

1. Frequency of a.c is decreased 

2. Magnetic field is increased 

3. Peak value of a.c is increased 

4. Both (1) & (2)

Subtopic:  Cyclotron (OLD NCERT) |
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A cyclotron cannot be used to accelerate 

1. Deutrons 

2. Protons 

3. Neutrons

4. Both (1) & (3)

Subtopic:  Cyclotron (OLD NCERT) |
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Cyclotron frequency does not depend upon

1. Specific charge

2. Speed of revolving particle

3. Magnetic induction

4. Charge

Subtopic:  Cyclotron (OLD NCERT) |
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The maximum kinetic energy of an α-particle coming out of a cyclotron accelerator is 20 MeV. The maximum kinetic energy of a proton that can be obtained from this accelerator is 

1. 20 MeV

2. 40 MeV

3. 10 MeV

4. 5 MeV

Subtopic:  Cyclotron (OLD NCERT) |
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A monoenergetic electron beam with an electron speed of 5.20 x 106 m/s is subject to a magnetic field of 1.30 x 10-4 T normal to the beam velocity. What is the radius of the circle traced by the beam, given e/m for electron equals 1.76 x 1011 C kg-1?

1. 22.7 cm
2. 21.3 cm
3. 20.0 cm
4. 21.9 cm

Subtopic:  Cyclotron (OLD NCERT) |
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An electron gun with its collector at a potential of 100 V fires out electrons in a spherical bulb containing hydrogen gas at low pressure ~10-2 mm of Hg. A magnetic field of 2.83×10-4 T curves the path of the electrons in a circular orbit of radius 12.0 cm. (The path can be viewed because the gas ions in the path focus the beam by attracting electrons, and emitting light by electron capture; this method is known as the 'fine beam tube' method. Specific charge ratio (e/m) is:
1. \(1.21 \times 10^{11} \mathrm{C}~ \mathrm{kg}^{-1}\)
2. \(1.73 \times 10^{11} \mathrm{C}~\mathrm{kg}^{-1}\)
3. \(2.53 \times 10^{11} \mathrm{C}~\mathrm{kg}^{-1}\)
4. \(3.02 \times 10^{11} \mathrm{C}~\mathrm{kg}^{-1}\)

Subtopic:  Cyclotron (OLD NCERT) |
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