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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) 1/25 (b) 1/5
(c) 5 (d) 25
(d) 25
Explanation : For parallel combination of five pieces:
1/R' = 5/R + 5/R + 5/R + 5/R + 5/R
1/R' = 25/R
R'/R = 25/1
R'/R = 25
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