Electric field

An oil drop having a charge q and apparent weight W falls with a terminal speed v in absence of electric field . When electric field is switched on it starts moving up with terminal speed v. The strength of electric field is

Assertion: A point charge is brought in an electric field. The field at a nearby point will increase, whatever be the nature of the charge. Reason: The electric field is independent of the nature of charge.

A cylinder on whose surfaces there is a vertical electric field of varying magnitude as shown. The electric field is uniform on the top surface as well as on the bottom surface therefore, this cylinder encloses

Assertion : The electric field due to a discrete charge configuration is not defined at the locations of the discrete charges. Reason : For a surface charge distribution, electric field is discontinuous across the surface.

An electron beam produces i) Electrical field around the beam ii) Magnetic field around the beam iii) Electrical field is more stronger than the magnetic field iv) Electrical and magnetic fields are not produced