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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
- IIT JAM
- Physics (PH)
Magmatism.
Q.1 What's reason of always using an "insulated" wire in solenoid???? Q.2 Tell me about the third point how it comes. I think diagram is not clear?!!!
2 Answer(s)
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Ruby negi Best Answer
everyone gave u reason for question 1 so think it is clear to u.. i attached solution for second ques(i.e part c), here only the direction of m.f changes the sign of B, and the direction of m.f is determined using right hand thumb rule, take wire in ur right hand so that thumb shows direction of current then the curl fingers show the direction of m.f, here also the left hand side wire gives the mf inward to the plane of paper(at point p) and then the right hand side wire give m.f outward to the the plane of paper( at point p) so now it depends on u , either u take outward direction as positive or inward direction as positive.. don't get confuse okay..m and for any doubt u can ask...best regards
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mam it means that the last line about the direction on my question can be reversed also i.e,\" the direction of B will be normal to the plane of paper upwards if B is negative and download B is positive" ????
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yeah it can be reversed, but mostly in question ,they ask for not sign but for directions ( so u have to write it's upward or downward) hope u r getting me..
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Somnath
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For your first question it is very simple to find out the reason.If we do not insulate the wire we will not get effect of solenoid because the wire of each turn will touch each other and current will not flow in a spiral path.It will travel along the shortest possible path.So we have to insulate the wire so that they can't touch. Now let's come to the second one. You have to calculate magnetic field at P.We know magnetic field at a distance r from a current carring conductor is (ui/2πr).Here field at P due to first wire is B= ui/2πx and it is upward.Field at P due to second wire is B" = ui/2π(r-x) and it is downward.Thus total upward magnetic field is B=B'-B".Now put the values of B' and B" you will get the answer.
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Ravi prakash yadav
diagram is not for case c.insulated wire in solenoid is also used so that we don't get shock.and wire is wrapped in iron core.if the wire won't be insulated,the current will flow through the iron also that's why we use insulated wire.
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Deepak singh 1
Insulated copper wire is used in making solenoid, because if we use without insulation current flows in the shortest path (straight path) and gets short circuited, so that it cannot behave as an electromagnet.