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Basic Principle Of Electric Pen

Sujoy Das
06/03/2018 0 0

Question:

What is the basic principle of electric pen ? Explain how it can be used for writing.

Answer:

Electric charge on ions is used for writing with an electric pen.

Method :

(i) Take a filter paper soaked in potassium iodide solution to which a pinch of starch is added.

(ii) Place the filter paper on a metal sheet.

(iii) Connect the negative terminal of battery to the metal sheet.

(iv) Write on the paper with the end of the wire connected to the positive terminal.


what-is-the-basic-principle-of-electric-pen-explain-how-it-can-be-used-for-writing-1

(v) The writing appears on the paper. This happens because the when current is passed, the K+ ions are attracted to the metal sheet. The iodide ions (I) react with starch to turn blue black.

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