A proton takes `10^(-12)s` to complete one revolution in uniform magnetic field. The time taken in another orbit of double the radius in the same field is

A proton and an alpha -particle start from rest in a uniform electric field. The ratio of times taken by them to travel the same distance in the field is

A proton carrying 1 MeV kinetic energy is moving in a circular path of radius R in uniform magnetic field. What should be the energy of an alpha- particle to describe a circle of the same radius in the same field?

Time taken by an electrons to complete one revolution in the Bohr orbit of the H atom is

The time taken for an electron to complete one revolution in Bohr orbit of hydrogen atom is-

Time taken by an electrons to complete one revolution in the Bohr orbit of the H atom is

A beam of protons with a velocity of 4 xx 10 ^5 ms^(-1) enters a uniform magnetic field of 0.3 T. The velocity makes an angle of 60^@ with the magnetic field. Find the radius of the helicla path taken by the proton beam and the pitch of the helix. Given that mass of proton = 1.67 xx 10^-27kg

A proton and an alpha particle accellerated throught the same potential differenc e enter a region of uniform magnetic field normally if the radius of the proton orbit is 10 cm ten radius of alpha particle is

An alpha particle of mass m moves on a circular path of radius r in a plane inside and normal to uniform magnetic field B. The time taken by this particle to complete one revolution is ________