A) \[R\]
B) \[R/n\]
C) \[R/{{n}^{2}}\]
D) \[{{n}^{2}}R\]
Correct Answer: C
Solution :
Key Idea: After cutting the resistance of each part decreases by factor n. The resistance of a wire of length\[l\]is R. After cutting the wire in n equal parts, the resistance of each part is\[R'=\frac{R}{n}.\] When these are connected in parallel, then \[\frac{1}{R''}=\frac{1}{R'}+\frac{1}{R'}+.....n\]times
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