Q: A metallic wire having length l and area of cross-section A has a resistance R. It is now connected in series with a wire of same metal but with length 2l and area of cross-section 2A. The total resistance of the combination will be:
(a)2R
(b)4R
(c)R
(d)R/2
Correct Answer: (a)
The correct answer is (a) '2R'. This question from the Quantitative Aptitude & Data Interpretation domain tests knowledge of Statistics & Probability.