In Thomson’s Experiment For determining , The Potential Difference Between The Cathode And The Anode (in The Accelerating column) Is The Same As That Between The Deflecting Plates (in The Region Of Crossed Fields). If The Potential Difference Is Doubled, By What Factor Should The Magnetic Field Be Increased To Ensure That The Electron Beam Remains Undeflected? 

In a cathode ray tube, the electrons are subjected to a potential difference of 182 V. The maximum speed acquired by the electrons is 

Electrons are projected with a velocity of  at right angles to a magnetic field of . If the radius of the circular path of electrons is 1 cm, what is the specific charge (charge to mass ratio) of electrons?

A proton projected with a velocity v describes a circle of radius r in a uniform magnetic field. With what velocity should an alpha-particle be projected so that it describes a circle of the same radius r in the same magnetic field?   

A proton projected with kinetic energy K describes a circle of radius r in a uniform magnetic field. With what kinetic energy should an -particle be projected in the same magnetic field so that it describes a circle of radius 2r?

A proton and an -particle projected with equal linear momenta describe circular paths of radii r₁ and r₂ respectively in a uniform magnetic field. The ratio  is

An -particle and a deuteron projected with equal kinetic energies describe circular paths of radii r₁ and r₂ respectively in a uniform magnetic field. The ratio  is  

In a cyclotron the speed of a charged particle is increased by

A monoenergetic electron beam with electron speed of  is subjected to a magnetic field of  normal to the beam velocity. What is the radius of the circular path traced by the beam? Given .

Two parallel plates are placed 5 cm apart in an evacuated tube and a potential difference of 200 V is applied across them. What is the force experienced by an electron at rest in the region between the plates?    

In Millikan’s oil drop experiment, a charged oil drop of mass  is held stationary between two parallel plates 6 mm apart by applying a potential difference of 1200 V between them. How many excess electrons does the oil drop carry? Take g = 10 ms^–2.