A cool easy problem 5

Electricity and Magnetism Level 2

A cylindrical copper rod has length 'L' and resistance 'R' .
If it is melted and formed into another rod of length '2L' ,
the resistance is:

4R R 2R 8R

A Former Brilliant Member by A Former Brilliant Member

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1 solution

Volume is constant
now since length is increased 2 times
resistance will be increased 2square times
new resistance = R x 2 x 2 = 4R

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We know that resistance is directly proportional to length if length is increased by 2 times then R should also be increased by two times only know??????

shakthiumadevi sathiyan - 6 years, 5 months ago

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You have forgotten than as length is increased, Area is proportionally Decreased!

Muhammad Arifur Rahman - 6 years, 4 months ago

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