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

Question

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:

Vimal Swarnkar · Accepted Answer

(a) 2R. R = ρl/A. Second wire: ρ(2l)/(2A) = R. In series: R + R = 2R → (a).

Answer

(b) 4R

Answer

(c) R

Answer

(d) R/2

Geo-Scientist Prelims 2020 General Studies Q105: A metallic wire having length l and area of cross-section A has a…

QuestionPhysics / current electricity