How does Ohm's law help calculate the charge/mass ratio of an electron such as the experiment...

Question

Question

How does Ohm's law help calculate the charge/mass ratio of an electron such as the experiment by JJ Thomson?

Answer 1

Answer #1

In JJ Thomson experiment we find out the charge/mass ratio by applying electric and magnetic field.

The e/m ratio comes out to be

e/m = E²/2VB²

Where V is the variable potential which we can use to balance charge and mass

The Potential is find out by ohms law.

V = IR

Here is the use of ohms law

thanks

Answer 2

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