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CBSE Class 10 Answered

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Asked by nkrbasak | 16 Oct, 2010, 09:34: PM
answered-by-expert Expert Answer
Dear student
 
(i) R = V / I  =  2 / 1 = 2 Ω
    Now R/l = 2/5 = 0.4 Ω/m
 
(ii) Resistance of 2m length of wire = 0.4 x 2 = 0.8 Ω
 
(iii) if the wire is doubled on itself ,new length = l/2    new area of cross-section = 2a
     so new resistance R' = R / 4 = 2 / 4 = 0.5 Ω
 
We hope this clarifies your doubt
 
Regards
Team
Topperlearning
Answered by | 18 Oct, 2010, 01:22: PM

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