Question

1 dyne/esu = _____ N/C

(a) 3*10^4

(b) 10^5

(c) 3*10^5

(d) 9*10^4

This question was posed to me in an online interview.

This key question is from Electric Field Lines in section Charges and Fields of Physics – Class 12

Answer 1

Right option is (a) 3*10^4

Best explanation: 1 N/C = \(\frac {1 N}{1 C} = \frac {10^5 dyne}{3*10^9 esu} = \frac {1}{3*10^4}\)dyne/esu. Therefore 1 dyne/esu=3*10^4 N/C. Both of them are the unit of electric field intensity. But N/C is the unit of electric field intensity in the SI system while dyne/esu is the unit of field intensity in the CGS system.