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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Conductors and Insulators
Last modified on:4 years agoReading Time:2MinutesConductors and Insulators Solids are mainly classified into two groups, conductors and insulators. In conductors, electric charges are free to move from one place to another, whereas in insulators they are tightly bound to their respective atoms. In an uncharged body, there are equal number of positive and negative charges. The…
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Electric Field Due to a Point Charge
Last modified on:3 years agoReading Time:1MinuteElectric Field Due to a Point Charge The electric field produced by a point charge q can be obtained in general terms from Coulomb’s law.First note that the magnitude of the force exerted by the charge q on a test charge q0 is then divide this value by q0 to obtain…
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Electric Field Due to a Charged Ring
Last modified on:3 years agoReading Time:4MinutesElectric Field Due to a Charged Ring A conducting ring of radius R has a total charge q uniformly distributed over its circumference. We are interested in finding the electric field at point P that lies on the axis of the ring at a distance x from its centre. We divide…
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MCQ Questions for Class 9 Science Chapter 4 Structure of the Atom
Last modified on:3 years agoReading Time:13MinutesHere we are providing MCQ Questions for class 9 Science Chapter 4 Structure of the Atom. These questions are prepared by subject experts. Students can practice these questions for better performance in the exam. Answers are kept hidden. You will be able to check the answer by clicking on the ‘Answer‘…
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NEET DPP Biology Ch-25 Human Reproduction
Last modified on:5 years agoReading Time:27MinutesQ.1. Breast feeding suspends pregnancy due to(a) post pregnancy lower levels of FSH and LH(b) post pregnancy higher levels of FSH and LH which put negative check on ovulation(c) inhibiting the release of LH by prolactin and thus countering the effects of LH on the ovarian follicles(d) increasing the release of…
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NEET DPP Biology Ch-24 Sexual Reproduction In Flowering Plants
Last modified on:5 years agoReading Time:27MinutesQ.1. Entry of pollen tube through micropyle is(a) Chalazogamy (b) Mesogamy(c) Porogamy (d) Pseudogamy Answer Answer: (c) In porogamy the tip of pollen tube enters the micropyle, pushes through the nucellar tissue & finally pierces the eggapparatus end of the embryo sac. If pollen tube enters through the chalazal side it…
