1.

The current in a simple series circuit is 5.0 amp. When an additional resistance of 2.0 ohms is inserted, the current drops to 4.0 amp. The original resistance of the circuit in ohms was                                          [KCET 2005]

A.         1.25                                  
B.         8
C.         10                                      
D.         20
Answer» C.         10                                      


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