Show that the specific charge of an electron is 1.76 ´ 10¹¹ C kg^-1.  Does the value vary for an electron?  Would it be different for a positron?                         

Specific charge = e/m = 1.6 ´ 10^-19 C ¸ 9.11 ´ 10^-31 kg (P)

= 1.76 ´ 10¹¹ C kg^-1

Value is constant. (P)

The value would be the same for a positron, (P)

since charge and mass are same (P)

But the sign would be different (P)