Thank you for registering.

One of our academic counsellors will contact you within 1 working day.

Please check your email for login details.
Close
MY CART (5)

Use Coupon: CART20 and get 20% off on all online Study Material

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price: Rs.

⇐ BackProceed to Checkout ⇒
There are no items in this cart.
Continue Shopping

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

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

Grade:12th pass

1 Answers

Pawan Prajapati
askIITians Faculty 6606 Points
2 months ago
Electric charge on ions is used for writing with an electric pen. Method : Take a filter paper soaked in potassium iodide solution to which a pinch of starch is added. Place the filter paper on a metal sheet. Connect the negative terminal of battery to the metal sheet. Write on the paper with the end of the wire connected to the positive terminal.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.

Think You Can Provide A Better Answer ?

Provide a better Answer & Earn Cool Goodies See our forum point policy

Other Related Questions on 8 grade science

View all Questions »

ASK QUESTION

Get your questions answered by the expert for free

Register ICAT

Answer and earn gift vouchers

Win Gift vouchers upto Rs 500/-

View courses by askIITians

Design classes One-on-One in your own way with Top IITians/Medical Professionals

Click Here Know More

Complete Self Study Package designed by Industry Leading Experts

Click Here Know More

Live 1-1 coding classes to unleash the Creator in your Child

Click Here Know More

a Complete All-in-One Study package Fully Loaded inside a Tablet!

Click Here Know More