A wire is 10 cm long and its resistance is 25 ohm .it is cut into 2 pieces of length 4 cm and 6 cm.what is d resistance of ech piece of wire
how to work out this problem?
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Answer:
the resistance of the wire with lenght 4cm is 10ohm,
and the resistance of the wire with lenght 6cm id 15 ohm.
Explanation:
in this question you only have to keep in mind that the resistivity and the area of cross section is constant in each case rest is a cake walk!
R1=10cm/A=25;
A=10/25=2/5;
R2=4cm/A;
4/R2 = 2/5 => R2= 10ohm
R3=6cm/A;
6/R3 =2/5 => R3 = 15ohm
*i didn't took into account the resistivity(rho) as it remains constant all through.
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