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Magnetism

Blazing goIITian

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29 Mar 2009 18:48:38 IST

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Two cables of copper are of equal lengths. One of them has a single wire of cross section A and the other has 10 wires of A/10 each. Give their suitability for transporting AC and DC.

1. Only multiple strands for AC, either for DC

2. Only multiple strands for AC, only single strand for DC

3. Only single strand for DC, either for AC

4. Only single strand for AC, either for DC.

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Comments (6)

Madmax

Blazing goIITian

Joined: 24 Dec 2007

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29 Mar 2009 19:02:39 IST

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Is The answer "Only multiple strands for AC, only single strand for DC"??

JPS

Blazing goIITian

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29 Mar 2009 21:26:14 IST

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no thats not the answer. olz xplain how u reached this ans.

Mr.Nasty ® Retired from Action.

Blazing goIITian

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29 Mar 2009 21:30:43 IST

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Is the answer 1) Multiple for AC either for DC?If correct Please rate.

JPS

Blazing goIITian

Joined: 21 Nov 2008

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29 Mar 2009 21:31:25 IST

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yes u r right. but explain how u arrived at the ans??

Mr.Nasty ® Retired from Action.

Blazing goIITian

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29 Mar 2009 21:34:51 IST

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See equivalent resistance in each case comes to be the same so for DC either can be used. So two options are eliminated. However in AC parallel circuits power loss is lesser so multiple for AC. Rate!

s faiyaz

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Joined: 30 Mar 2009

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31 Mar 2009 01:09:55 IST

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in D.C iether of the two can be used but in ac, due to varying current and hence varying magnetic field, small small circuit loop forms which results in power loss . to reduce this power loss we reduce cross section to reduce circuit size but to transfer same amount of power need more such thin wires in parallel which is very familiar in daily life

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