English

If a Watch-glass Containing a Small Quantity of Water is Placed on Two Dissimilar Magnetic Poles, Then Wate - Physics

Advertisements
Advertisements

Question

If a watch-glass containing a small quantity of water is placed on two dissimilar magnetic poles, then water ______.

Options

  • shows a depression in the middle.

  • shows an elevation in the middle.

  • surface remains horizontal.

  • evaporates immediately.

MCQ

Solution

shows a depression in the middle. 

shaalaa.com
  Is there an error in this question or solution?
2016-2017 (March)

APPEARS IN

RELATED QUESTIONS

Draw a neat labelled diagram for the construction of 'cyclotron'


In a cyclotron, magnetic field of 3·5Wb/m2 is used to accelerate protons. What should be the time interval in which the electric field between the Dees be reversed?
(Mass of proton = 1· 67 x 10-27Kg, Charge on proton =1·6x10-19c).


Obtain the expression for the cyclotron frequency.


A deuteron and a proton are accelerated by the cyclotron. Can both be accelerated with the same oscillator frequency? Give reason to justify your answer.


An α-particle and a proton are released from the centre of the cyclotron and made to accelerate.

(i) Can both be accelerated at the same cyclotron frequency?

Give reason to justify your answer.

(ii) When they are accelerated in turn, which of the two will have higher velocity at the exit slit of the does?


Explain the principle and working of a cyclotron with the help of a schematic diagram. Write the expression for cyclotron frequency.


A cyclotron is used to accelerate protons to a kinetic energy of 5 MeV. If the strength of magnetic field in the cyclotron is 2T, find the radius and the frequency needed for the applied alternating voltage of the cyclotron. (Given : Velocity of proton= `3xx10^7 m//s`)


Which of the following particles will describe the smallest circle when projected with the same velocity perpendicular to a magnetic field?


If a charged particle kept at rest experiences an electromagnetic force,
(a) there must be an electric field
(b) there must be a magnetic field
(c) both fields cannot be zero
(d) both fields can be non-zero


Figure shows a rod PQ of length 20.0 cm and mass 200 g suspended through a fixed point O by two threads of lengths 20.0 cm each. A magnetic field of strength 0.500 T exists in the vicinity of the wire PQ, as shown in the figure. The wires connecting PQ with the battery are loose and exert no force on PQ. (a) Find the tension in the threads when the switch is open. (b) A current of 2.0 A is established when the switch S is closed. Find the tension in the threads now.


(a) An electron moves along a circle of radius 1 m in a perpendicular magnetic field of strength 0.50 T. What would be its speed? Is it reasonable? (b) If a proton moves along a circle of the same radius in the same magnetic field, what would be its speed?


\[\ce{Fe+}\] ions are accelerated through a potential difference of 500 V and are injected normally into a homogeneous magnetic field B of strength 20.0 mT. Find the radius of the circular paths followed by the isotopes with mass numbers 57 and 58. Take the mass of an ion = A (1.6 × 10−27) kg, where A is the mass number.


Answer the following question.
State the underlying principle of a cyclotron. Explain its working with the help of a schematic diagram. Obtain the expression for cyclotron frequency.


Cyclotron is used to ______.


Assertion: The frequency of circular motion of a charged particle in cyclotron is independent of the mass of the particle.
Reason: Greater the mass of the particle less will be the frequency of the particle.


In cyclotron the gyro radius is ______.

In cyclotron the resonance condition is ______.

A charged particle is moving in a cyclotron, what effect on the radius of path of this charged particle will occur when the frequency of the ratio frequency field is doubled?


Which of the following is not correct about cyclotron?


A particle of mass m is moving in a circular path of constant radius r such that, its centripetal acceleration ac is varying with time t as ac = k2rt2, where k is a constant. The power delivered to the particle by the forces acting on it is ______.


The life time of muon in the rest frame is 2 × 10-6 sec. A beam of muons emerges from a cyclotron with velocity where c is the velocity of light The mean life of muons observed in the laboratory frame will be ______.


In a cyclotron, a charged particle ______.


Describe the motion of a charged particle in a cyclotron if the frequency of the radio frequency (rf) field were doubled.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×