Heat generated

JEE Mains Sample Questions › Electricity and magnetism questions › Heat generated

A wire of resistance ' R ' and length ' L ' is connected to a d.c. source of emf V through a switch ' S '

At t = 0, the switch ' S ' is closed and at the same time an external agent starts stretching the wire such that its length increases at a constant rate ' K '. Then the total heat generated in the wire due to flow of current when its length becomes ' 2L ' is :

#Physics #Electricity and magnetism #Electric Current

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5 Answers

535

Aditya Agarwal ·2014-02-10 15:02:16

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Anurag Ghosh Thanks..:)
Upvote·0· Reply ·2014-02-10 17:54:23
Aditya Agarwal Welcome. :)
Upvote·0· Reply ·2014-02-10 18:13:28
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591

Akshay Ginodia ·2014-02-10 04:34:14

V²LRKln2

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Akshay Ginodia ??
Upvote·0· Reply ·2014-02-10 04:34:25
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486

Niraj kumar Jha ·2014-02-10 04:53:03

v²LRKln2?

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481

Anurag Ghosh ·2014-02-10 05:46:35

Answer given is
v^2L/2RK

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Anurag Ghosh ·2014-02-10 18:08:00

Akshay U didn't conserve the volume,only the lenght,so the Log2 term comes in your answer.

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Your Answer

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