IMPORTANT: PLZ READ BELOW BEFORE MAKING ANY POSTS..
i have created a doubts thread for each topic in the jee syllabus...this is for electricity... ANSWERS FOR THIS TOPIC: http://www.goiit.com/posts/list/0/electricity-ultimate-answers-thread-electricity-37491.htm#185508 LINKS TO OTHER TOPICS: PHYSICS:
This thread is only for asking doubts.....the answers to these doubts MUST be given in the separate answers thread which i have created....
i will be constantly updating this list with more and more doubts.. while replying to a particular doubt...please mention the doubt number and give ur answer... scheme for awarding points...
1)very satisfied-15 2)ok-5 3)just attempt to answer-2
....if any one else also has some of these doubts that are in this post...then i advise u to also rate those ppl who have answered following the scheme given above... now u guys can also post ur own doubts....but follow very strict rules...if u are having a doubt give the doubt numbers sequentially...following those who have posted before u...also if u have any new doubts to add DO NOT edit ur previous posts...but give a fresh post... in the answers thread while answering doubts plz refer to the doubt number while answering... and if u have answered a doubt it would be advisable to nudge the person who has asked the doubt...so that he/she will get to know...
1.consider a battery whose terminals are connected by a pure conducting wire then since there can be no potential difference between any 2 points on a pure conductor...the net potential difference between any two points is zero...then how come there exists a potential difference between the two ends of the conductor??
2.consider a terminal of a battery...if the battery is not connected to any external circuit..then does it mean that charge has accumulated on each terminal of the battery due to the constant driving force?? if so how do we know how much charge has accumulated on each end??
3.we say that emf of a battery is the potential difference across its ends.... consider a battery of emf E.. does it mean that one terminal is at a potential of zero and that the other one is at a potential of E...or can it be that the terminals can have any potentials but they are such that their difference is always E?? does this differ from battery to battery??...
4. once the circuit is complete and charges start flowing...will there be any net electric field near the terminals?? what about in the air near the conducting wires??
5. i have read that the electric field inside the conductor is the potential difference divided by the length of the conductor....does it mean that if the length of the conductor increases then the electric field will be less?? what about in the above case when the resistance is zero??
6.if you consider any small length of a conductor(with resistance) what causes the electric field between its two ends?? whatever charge goes in comes out so how come there is an electric field?? and how exactly is this electric field "transferred" from the ends of a battery to an point in a conductor?is this the main purpose of conducting wires??
7. what will the electric field lines look like in an small length of the conductor??
8.what causes a potential drop between the two ends of a resistor?? also what is the cause of heat in a resistor?? is it due to KE of the electrons being converted to thermal energy?? if that is the case then when electrons move in to the resistor let them have a velocity v.. let the resistor have a uniform cross section A....then since if they lose some of their KE their velocity must be reduced...but by conservation of charges the number of electrons going in must be equal to the number of electrons going out... this means that somehow the acceleration of the electrons due to the must act in such a way that the velocity remains constant throughout...how is this always the case??
ans-3 it does not mean that one terminal is at a potential of zero and that the other one is at a potential of E. only the potential difference is E. we take one at 0 and other at E to make question easy
Moderation Team
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