A charged particle of charge q and mass m enters perpendicularly in a magnetic field  Kinetic energy of the particle is E, then frequency of rotation 

Two equal electric currents are flowing perpendicular to each other as shown in the figure. AB and CD are perpendicular to each other and symmetrically placed with respect to the currents, where do we expect the resultant magnetic field to be zero?

A 10 eV electron is circulating in a plane at right angles to a uniform field of magnetic induction 10^-4 Wb/m² ( =1.0 gauss). The orbital radius of the electron is

Current is flowing in a coil of area A  and number of turns N, then magnetic moment of the coil, M is equal to

A deutron of kinetic energy 50 keV is describing a circular orbit of radius 0.5 m in a plane perpendicular to magnetic field B.  The kinetic energy of the proton that describes a circular orbit of radius 0.5 m in the same plane with the same B is

A uniform magnetic field acts right angles to the direction of motion of electrons.  As a result, the electron moves in a circular path of radius 2 cm.  If the speed of electrons is doubled, then the radius of the circular path will be 

A current carrying coil is subjected to a uniform magnetic field. The coil will orient so that its plane becomes 

Magnetic field due to 0.1 A current flowing through a circular coil of radius 0.1m and 1000 turns at the centre  of the coil is

A straight wire of length 0.5 m and carrying a current of 1.2 A is placed in uniform magnetic field of induction 2 T.  The magnetic field is perpendicular to the length of the wire. The  force on the wire is