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In a meter bridge experiment, a uniform wire of length 1.8 meters and crosssectional area A = 3×10−6 m2 is used. The bridge is balanced with a standard resistor of 8 ohms in one gap and the unknown wire in the other gap. The length of the unknown wire on the side of the standard resistor is 1.2 meters. Determine the resistivity (ρ) of the unknown wire material. Express your answer in terms of fundamental constants and known quantities.

 

Option: 1

2 ×10−5ohm


Option: 2

9×10−5 ohm


Option: 3

35 ×10−5ohm


Option: 4

78 ×10−5ohm


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