Two copper conductors have equal length. The cross-sectional area of one conductor is four times that of the other. If the conductor having smaller cross-sectional area has a resistance of 40 ohms the resistance of other conductor will be
A. 160 ohms
B. 80 ohms
C. 20 ohms
D. 10 ohms
Answer: Option D
This Question Belongs to Electrical Engineering >> Current Electricity
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Related Questions on Current Electricity
Resistance of a material always decreases if
A. Temperature of material is decreased
B. Temperature of material is increased
C. Number of free electrons available becomes more
D. None of the above is correct
The minimum charge on an ion is
A. Equal to the atomic number of the atom
B. Equal to the charge of an electron
C. Equal to the charge of the number of electrons in an atom
D. Zero
Current velocity through a copper conductor is
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B. independent of current strength
C. of the order of a few micro m/s
D. nearly 3 x 108 m/s
R= rhol/A
then 40/4 = 10 ohms