Assertion (A), study of discharge of electricity through gases at low pressure resulted in the discovery of cathod rays .
Reason (R ): cathod rays are deflected by both magnetic and electric fields and the direction of deflection shows that they are nagatievly charged .

Options

A. `A` and `R` are true and `R` is the correct explaination of `A`
B. `A` and `R` are true and `R`is not the correct explaination of `A`
C. `A` is true and `R` is false.
D. `A` is false but `R` is true

Answer

B