Question

complaint letter to police commissioner complaining against chain snatching and pickpocketing prominent in the locality

Answer 1

to-mass ratio of the electron

The first is the experiment of Joseph John Thomson, who first demonstrated that atoms are actually composed of aggregates of charged particles. Prior to his work, it was believed that atoms were the fundamental building blocks of matter. The first evidence contrary to this notion came when people began studying the properties of atoms in large electric fields.



If a gas sample is introduced into the region between two charged plates, a current flow can be observed, suggesting that the atoms have been broken down into charged constituents. The source of these charged particles is a heated cathode that, in fact, causes the atoms of the sample to ionize. These were known as cathode rays. In 1897, Thomson set out to prove that the cathode rays produced from the cathode were actually a stream of negatively charged particles called electrons. (See Figure 1.8 in the textbook for Thomson's experimental setup). From Maxwell's theory, he knew that charged particles could be deflected in a magnetic field. A schematic of the experimental setup is shown below:

Figure 1: Schematic of J.J. Thomson's experiment.



We now zero in on the field region and set up a coordinate system as shown in the figure below:

Figure 2:



In this coordinate system, electrons enter the region between the plates with an (unknown) velocity  in the -direction. In order