NEET Physics Current Electricity Questions Solved


A metal rod of square cross-sectional area A having l has current I flowing throwing it when a potential difference of V volt is applied across its ends (figure I). Now the rod is cut parallel to its length into two identical pieces and joined as shown in figure II. What potential difference must be maintained across the length 2l so that the current in the rod is still I?                                                                                                                                                                       (2 marks)

                 

                  Figure-I                                                                      Figure - II

 

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