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CBSE Class 10 Answered

numerical
Asked by deepitapai | 05 Feb, 2009, 04:04: PM
answered-by-expert Expert Answer

R(Resistance) = V (Voltage) / I(Current)
R = 2/1 = 2 Ω

1) The resistance per unit length = resistance / length = 2/5 = 0.4 Ω/m

2) The resistance of 2 m length of wire is = 0.4 x 2 = 0.8Ω

3) If it is doubled on itself the length becomes L/2 and the area of crossection becomes 2A
The resistance (R) = ρl/A  hence the new resistance will become R/4.

R will now be = 2/4 = 0.5Ω

Answered by | 05 Feb, 2009, 08:15: PM

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