Question

Among the following, the correct statement about cathode ray discharge tube is:

Answer 1

Correct option is B. in the absence of external electrical or magnetic field, cathod rays travel in straight lines

Cathode rays or stream of electrons and move in a straight a line without any deflection in the absence of electric field and magnetic field. But in the presence of the electric field, the cathode rays are deflected towards the positive pole.

Hence option B is correct.