On which of the following techniques photo state machine works ?

On which of the following techniques photo state machine works? 

(1) Magnetic Image-Making 

(2) Thermal Image-Making 

(3) Electrostatic Image-Making 

(4) Electromagnetic Image-Making 

Answer: (3) All Electrostatic Copiers work under the premise that a charge of electricity is placed on an Image Drum which has the ability to retain the electric charge much like a capacitor holds its charge but with the ability to hold or release the charge depending on how much light and darkness is applied to the Image Drum. A photocopier (also known as a copier or copy machine) is a machine that makes paper copies of documents and other visual images quickly and cheaply. Most current photocopiers use a technology called xerography, a dry process using heat. Copiers can also use other technologies such as inkjet, but xerography is standard for office copying. 

On which of the following tech niques photostate machine works ?   (1) Magnetic Image—Making   (2) Thermal Image—Making   (3) Electrostatic Image—Making   (4) Electromagnetic Image— Making

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