Any of two or more forms of the same element which differ only in the number of neutrons their atoms contain is called an
a. irregularity
b. isomer
c. isotope
d. irritability

C. isotope

Isotopes have the same atomic number but different mass number because of the difference in the number of neutrons in the nucleus of the atom.

The modern-day generator works on the principle of electromagnetic induction discovered by michael faraday in 1831-32. faraday discovered that the above flow of electric charges could be induced by moving an electrical conductor, such as a wire that contains electric charges, in a magnetic field.