Table of Contents
Charging of Insulators
Since charge cannot flow through insulators, neither conduction nor induction can be used to charge, insulators, so in order to charge an insulator friction is used. Whenever an insulator is rubbed against a body exchange of electrons takes place between the two. This results in appearance of equal and opposite charges on the insulator and the other body. Thus the insulator is charged.
For example rubbing of plastic with fur, silk with glass causes charging of these things.
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Numerical on Power of a Lens for CBSE Class 10
Last modified on:4 years agoReading Time:9MinutesQ.1. A concave lens produces an image 20 cm from the lens of an object placed 30 cm from the lens. Calculate the power of the lens. Q.2. A convex lens is of focal length 10 cm. What is its power? Q.3. A person having a myopia eye uses a concave…
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Numerical on Refraction of Light for CBSE Class 10
Last modified on:4 years agoReading Time:6MinutesQ.1. Light travels through water with a speed of 2.25 x 108 m/s. What is the refractive index of water? Q.2. Light travels from rarer medium 1 to a denser medium 2. The angle of incident and refraction are respectively 450 and 300. Calculate the (i) refractive index of second medium…
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Protected: Magnetism and Matter
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