In a cyclotron, if a deuteron can gain the energy of 40 MeV, then

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 Multiple Choice QuestionsMultiple Choice Questions

281.

A candidate connects a moving coil ammeter A and a moving coil voltmeter V and a resistance R as shown. If the voltmeter reads 20 V and the ammeter reads 4 A, then R is

  • equal to 5Ω

  • greater than 5Ω

  • less than 5Ω

  • none of these


282.

Two identical galvanometers are taken, one is to be converted into an ammeter and other into a milliammeter. The shunt of milliammeter compared to ammeter is

  • less

  • more

  • zero

  • none of these


283.

If the vibrations of a string are to be increased by a factor of two, the tension in the string should be made

  • twice

  • four times

  • eight times

  • half


284.

Which of the following has the minimum resistance?

  • Voltmeter

  • Millivoltmeter

  • Ammeter

  • Milliameter


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285.

In a cyclotron, if a deuteron can gain the energy of 40 MeV, then a proton can gain the energy of:

  • 40 MeV

  • 80 MeV

  • 20 MeV

  • 60 MeV


B.

80 MeV

Maximum energy in a cyclotron.

E = 12B2q2R2m

where R = radius of dees of the cyclotron

EdEp = qdqp2. mpmd40Ep = qq2. m2m

Ep = 80 MeV


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286.

An electron, moving in a uniform magnetic field of induction of intensity B, has its radius directly proportional to:

  • its charge

  • magnetic field

  • speed

  • none of these


287.

A uniform magnetic field is at a right angle to the direction of motion of proton. As a result, the proton describes a circular path of radius 2.5 cm. If the speed of proton is doubled then the radius of the circular path will be :

  • 0.5 cm

  • 2.5 cm

  • 5.0 cm

  • 7.5 cm


288.

An electron accelerated through a potential difference enters into a uniform transverse magnetic field and experience a force F. If the accelerating potential is increased to 2V, the electron in the same magnetic field will experience a force :

  • F

  • F/2

  • 2 F

  • 2F


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289.

The certain amount of current when flowing in a properly set tangent galvanometer produces a deflection of 45°. The current be reduced by a factor of ✓3, the deflection would :

  • decrease by 30°

  • decrease by 15°

  • increase by 15°

  • increase by 30°


290.

A wire carrying current I and other carrying 2I in the same direction produce a magnetic field B at the mid-point. What will be the field when 2I wire is switched off?

  • B/2

  • 2B

  • B

  • 4B


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