इन दो Planets के पास magnetic field नहीं है | facts about space | information about solar system

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

Electric field lines provide information about

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 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.

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 circular coil of radius r is placed in a uniform magnetic field B. The magnetic field is normal to the plane of the coil is rotated at an angular speed of omega , about its own axis , then the induced emf in the coil is __