When we remove polyester or woolen cloth in dark, we can see a spark and hear a cracking sound. These are due to:
  • A
    Static electricity
  • B
    Current electricity
  • C
    Reflection of light
  • D
    Refraction of light

Solution

When we remove polyester or woolen cloth in dark, we can see spark and hear a cracking sound. These are due to effect of static electricity.