पृथ्वी के पास magnetic field क्यों है | facts about space in hindi | information about solar system

Electric field lines provide information about

Which one of the following is correct information about G.E.R.L. system

In a conductor, there are free electrons which continuously move randomly but inside the volume of the conductor. When such a conductor is placed inside a magnetic field then what can you say about the magnetic forces acting on the system?

A circular loop is kept perpendicular to a uniform magnetic field. Loop is rotated about its diameter with constant angular velocity.

A magnet is suspended horizontal in the earth's magnetic field. When it is displaced and then released it oscillates in a horizontal plane with a period T. If a place of wood of the same moment of inertia (about the axis of rotation) as the magnet is attached to the magnet what would the new period of oscillation of the system become?

A rectangular coil rotates about an axis normal to the magnetic field, If E_(m) is the maximum value of the induced emf, then the instantaneous emf when plane of the coil makes an angle of 45^(@) with the magnetic field is

A system consists of two parallel planes carrying currents producing a unifrom magnetic field of induction B between the planes. Outside this space there is no magnetic field. Find the magnetic force acting this space there is no magentic field. Find the magnetic force acting per unit area of each plane.