A piece of wire of resistance R is cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is R’, then the ratio R/R’ is :
A. (frac { 1 }{ 25 })
B. (frac { 1 }{ 5 })
C. 5
D. 25
Answer:D
A piece of wire of resistance R is cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is R’, then the ratio R/R’ is :
A. (frac { 1 }{ 25 }) B. (frac { 1 }{ 5 }) C. 5 D. 25