A cyclotron is used to accelerate from Physics Moving Charges An

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151.

A galvanometer of resistance 50 Ω gives a full scale deflection for a current 5 x 10-4 A. The resistance that should be connected in series with the galvanometer to read 3 V is

  • 5059 Ω

  • 595 Ω

  • 5950 Ω

  • 5050 Ω


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152.

A cyclotron is used to accelerate

  • only negatively charged particles

  • neutron

  • both positively and negatively charged particles

  • only positively charged particles


D.

only positively charged particles

As, electrons cannot be accelerated in a cyclotron A large increase in their energy increases their velocity to a very large extent. This throws the electrons out of step with the oscillating field whlle, neutron being electrically neutral, cannot be accelerated in a cyclotron. So, cyclotron is used to accelerate only positively charged particle.


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153.

A proton is projected with a uniform velocity v along the axis of a current-carrying solenoid, then

  • the proton will be accelerated along the axis

  • the proton path will be circular about the axis

  • the proton move along helical path

  • the proton will continue to move with velocity v along the axis


154.

In the cyclotron, as radius of the circular path of the charged particle increases (ω = angular velocity, v = linear velocity)

  • both ω and v increase

  • ω only increases, v remains constant

  • v increases, ω remains constant

  • v increases, ω decreases


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155.

A conducting wire carrying current is  arranged as shown in the figure. The magnetic field at O is

            

  • μ0i12 1R1 - 1R2

  • μ0i12 1R1 + 1R2

  • μ0i6 1R1 - 1R2

  • μ0i6 1R1 + 1R2


156.

A galvanometer coil has a resistance of 50 Ω and the meter shows full scale deflection for a current of 5 mA. This galvanometer is converted into voltmeter of range 0-20 V by connecting

  • 3950 Ω in series with galvanometer

  • 4050 Ω in series with galvanometer

  • 3950 Ω in parallel with galvanometer

  • 4050 Ω in parallel with galvanometer


157.

A long solenoid with 40 turns per cm carries a current of 1 A. The magnetic energy stored per unit volume is

  • 3.2 π Jm-3

  • 32 π Jm-3

  • 1.6 π Jm-3

  • 6.4 π Jm-3


158.

A proton, a deuteron and an α-particle are projected perpendicular to the direction of a uniform magnetic field with same kinetic energy. The ratio of the radii of the circular paths described by them is

  • 1 : 2 : 1

  • 1 : 2 : 2

  • 2 : 2 : 1

  • 2 : 1 : 1


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159.

A galvanometer of resistance 50 Ω is connected to a battery of 3 V along with. a resistance of 2950 Ω in series shows full-scale deflection of 30 divisions. The additional series resistance required to reduce the deflection to 20 divisions is

  • 2950 Ω

  • 1500 Ω

  • 4450 Ω

  • 7400 Ω


160.

A magnetic dipole of magnetic moment 6 × 10-2 A-m2 and moment of inertia 12 x 10-6 kg-m2 performs oscillations in a magnetic field of 2 x 10-2 T. The time taken by the dipole to complete 20 oscillations is (π ≈ 3)

  • 18 s

  • 6 s

  • 36 s

  • 12 s


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