Based on the data thomson collected in his experiments using cathode rays, the concept of atomic structure was modified. what were the four things that were validated by his cathode ray experiments?

How can you increase the strength of an electromagnet?

Two pans of a balance are 24.1 cm apart. the fulcrum of the balance has been shifted 1.33 cm away from the center by a dishonest shopkeeper. by what percentage is the true weight of the goods being marked up by the shopkeeper? assume the balance has negligible mass. answer in units of %.

The field between two charged parallel plates is kept constant. if the two plates are brought closer together, the potential difference between the two plates either a) decrease b) does not change c) increase?