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Reader questions and feedback on physical science. Also refer to physics, chemistry, astronomy, electricity, magnetism, electromagnet, light, sound, waves, forces, work, energy, friction, heat, thermodynamics, Ron Kurtus, School for Champions. Copyright © Restrictions Answers to Readers' Questions on Physical Science:Electrical ChargesThe following 40 comments and questions have been sent in. They are listed according to date. List of first 10 items
Are only electromagnets used in computers?QuestionJune 30, 2010 can only electromagnets be applied to make a computer. Chrispus - Kenya 19992 AnswerElectromagnets are used in many electrical and electronic devices, including computers. One good example is the electrical motor. How does a NAND gate work?QuestionJune 30, 2010 how does a NAND gate work Chrispus - Kenya 19991 AnswerA NAND gate is a logic circuit that is a "Not And" gate. And AND gate will combine two signals, only if both are true. A NAND gate combines two signals except when they both are true. Using capacitor to change AC to DCQuestionJune 30, 2010 can capacitor be used to change AC(alternating current) to DC(direct current). chrispus - Kenya 19990 AnswerA capacitor stores electrical charges. Typically AC passes right through a capacitor, with only shift in phase. However, a capacitor may be used in a rectifier circuit. A rectifier flips one-half of an AC cycle to result in choppy DC current. Confused about positive and negative chargesQuestionApril 25, 2010 How is it that the electron's electrical charge is considered negative, and the proton's is considered positive? Shouldn't the reverse be true for normal matter? - USA 19601 AnswerThe assignment of positive and negative charges was made years before scientists understood about electrical currents. The words "positive" and "negative" are misleading, because they really don't represent what they do in mathematics. Experiments proving the direction of electricityQuestionMarch 15, 2010 WHAT ARE THE EXPERIMENTS WHICH MADE THE SCIENTISTS TO AGREE THAT ELECTRIC FIELD FLOWS FROM POSITIVE TO NEGATIVE CHARGES?PLEASE GIVE ME A CLEAR EXPLANATION? K PRANEETH - India 19371 AnswerA number of scientists in the 1800s did experiments with electrons. For some reason they gave electrons a negative (-) charge. Later, it was discovered that electricity is the flow of electrons toward a positive charge. What is a coulomb?QuestionFebruary 27, 2010 what is coulomb charge ? qamar - India 19304 AnswerA coulomb (C) is a unit of electrical charge. One coulomb is the amount of electrical charge of a current of one ampere over one second. What is a point charge?QuestionFebruary 27, 2010 what does mean by point charge? qamar - India 19303 AnswerA point charge is the electrical charge at a point in space, as if an electron or proton had no dimensions. In fact, from far enough away, an object of any shape will look and behave as a point-like object. This makes calculations more convenient. Using electrical charges to cause car to hoverQuestionFebruary 24, 2010 Are we able to control the push force that is made when to like charges are close together, In other words could I control the "push" enough to where I can use it to make a skateboard or a car hover but with full control? J.J. - USA 19282 AnswerThe only way to gather charges on the surface of an object is to use static electricity. Like static electric charges will push object apart, although the force is small. An extreme amount of electrical charges would be necessary to move a skateboard. Do like charges attract or repel?QuestionFebruary 15, 2010 Somebody asked a question dat do like charges attract,am here to answer a question.like or similar charges donot attract but repel each other bcz it's jst like an ebonite rod which is rubbed wit fur,dat has no charge on it. Van vicker - Nigeria 19224 AnswerLike electrical charges repel and unlike charges attract. Likewise, like magnetic poles repel and unlike magnetic poles attract. Why is repulsion used to examine charges?QuestionNovember 8, 2009 why is repulsion considered as the surer test for having charge on a body? tapash - India 18632 AnswerIf you have two light weight objects on a string, such as pith balls or small balls of tissue, giving them both the same charge will cause them to separate and stay separated for a while. You can even measure the separation. SummaryHopefully, this reader feedback has helped provide information about Science issues. ResourcesThe following are some resources on this topic. WebsitesBooks
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