If an electron moves in a circular path with velocity v in a magnetic field B, then during a semicircular journey, its gain in energy will be-

If an electron is moving with velocity v produces a magnetic field vecB , then

If an electron is moving with velocity v produces a magnetic field vecB , then

An electron is moving on a circular path of radius r with speed v in a transverse magnetic field B. e/m for it will be

An electron is moving on a circular path of radius r with speed v in a transverse magnetic field B. e/m for it will be

A charged particle is moving on circular path with velocityv in a uniform magnetic field B, if the velocity of the charged particle is doubled and strength of magnetic field is halved, then radius becomes

A charged particle is moving on circular path with velocityv in a uniform magnetic field B, if the velocity of the charged particle is doubled and strength of magnetic field is halved, then radius becomes

An electron of energy 150ev describe a circular path in a magnetic field of 1 T. Calculate the radius of circle.

If an electron has an initial velocity perpendicular to direction of magnetic field, the path of the electron is

In a homogeneous magnetic field B there is an electron moving in a circular orbit with a speed v. Find the ratio of the magnetic field generated by the moving electron at the middle of the circle and the magnetic field making it revolve.