Question

Which of the following statements is not the result of cathode ray discharge tubeexperiment with perforated anode?

• A. In the absence of electric or magnetic field, the cathode rays travel in straight line.
• B. In the presence of electric or magnetic field, the behaviour of cathode rays issimilar to that expected from negatively charged particles
• C. In the presence of electric and magnetic field, the cathode rays travel in straightline.
• D. The cathode rays start from the cathode and move toward the anode.

Answer 1

Answer: (C)

In presence of electric and magnetic field, the cathode rays travel in straight line is not the result. Actually, they are deflected by electric and magnetic field. When the rays are passed between two electrically charged plates, these are deflected towards positively charged plate. In magnetic field, they are deflected at a right angle to both the field and to the direction of particle.