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?

The total charge induced in a conducting loop when it is moved in magnetic field depends on

A charge moving with velocity v in X-direction is subjected to a field of magnetic induction in negative X – direction . As a result, the charge will

A coil of one turn is made of a wire of certain length and then from the same length a coil of two turns is made. If the same current is passed is both the cases, then the ratio of the magnetic induction at their centers will be

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 

The electron enters a region where magnetic field (B) and electric field (E) are mutually perpendicular, then

A galvanometer of resistance 50 Ω is connected to a battery of 3 V along with a resistance of 2950 Ω in series. A full scale deflection of 30 divisions is obtained in the galvanometer. In order to reduce this deflection to 20 divisions, the resistance in series should be

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 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

The magnetic field at a distance  r from a long wire carrying current  I is 0.4 T.  The magnetic field at a distance 2r is