A message signal of peak value 2 V is used to modulate a carrier wave of peak value 10 V. The modulation index of the amplitude modulated wave is:

0.2

The correct answer is Option (1) → 0.2

Modulation Index (m) is,

$m=\frac{Peak\,value\,of\,message\,signal(A_m)}{Peak\,value\,of\,carrier\,signal(A_c)}$

$m=\frac{A_m}{A_c}=\frac{2}{10}=0.2$