Terbium salts are used in optical devices like laser devices.
Terbium’s alloy lengthens and shortens the magnetic field and this effect forms loudspeaker.
  
It is also used in insecticides, hair dyes and as an anti-knocking additive for petrol. But all these are banned by the government as Lead metal is known for detrimental to health.
  
Industrial Uses
Electronic Industry
  
Chemical Industry, Electrical Industry, Electronic Industry