A certain region of space is to be shielded from magnetic fields. Suggest a method.

In a certain region of space electric field vecE and magnetic field vecB are perpendicular to each other and an electron enters in region perpendicular to the direction of vecB and vecE both and move underflected, then velocity of electron is

(A) : If an electron is not deflected while passing through a certain region of space, then only possibility is that there is no magnetic field in this region (R) : Force on an electron moving in a magnetic field is inversely proportional to the magnetic field applied.

(A) : If an electron is not deflected while passing through a certain region of space, then only possibility is that there is no magnetic field in this region. (R) : Magnetic force on a charged particle is directly proportional to specific charge of particle.

When will be the magnetic field uniform?

A sensitive instrument is to be shielded from the strong electrostatic fields in its environment. Suggest a possible way.

An electron enters a region of space in which there exists an electric field 'E' and magnetic field 'B'. If the electron continues to move in the same direction with same velocity as before, the NOT possible case among the following is