A device used to test whether an object is carrying charge or not is called 

The correct answer is 'Electroscope'

Key Points

• Electroscope:
  • An electroscope is a device used to detect the presence and magnitude of electric charge on a body.
  • It consists of a metal rod with thin metal leaves (usually gold or aluminum) attached to it, enclosed in a glass container to prevent interference from air currents.
  • When a charged object is brought near or in contact with the metal rod, the leaves repel each other due to the like charges repelling, indicating the presence of charge.

Additional Information

• Electrometer:
  • An electrometer is an instrument for measuring electrical potential difference or voltage.
  • It is highly sensitive and can detect very small electric charges, but it is not typically used to test whether an object is carrying a charge.
• Charge meter:
  • There is no widely recognized scientific instrument known as a "charge meter."
  • This term might be confused with devices like electrometers or electroscopes, but it is not a standard term in physics.
• Chargoscope:
  • Similar to the "charge meter," there is no scientific instrument known as a "chargoscope."
  • This term is not used in the field of physics for detecting or measuring electric charge.