A) \[\rho =\frac{X\pi D}{4L}\]
B) \[\rho =\frac{X\pi {{D}^{2}}}{4L}\]
C) \[\rho =\frac{{{X}^{2}}\pi {{D}^{2}}}{4L}\]
D) \[\rho =\frac{X\pi {{D}^{2}}}{4{{L}^{\,2}}}\]
Correct Answer: B
Solution :
The specific resistance \[\text{( }\!\!\rho\!\!\text{ )}\]is determined by the formula \[\text{ }\!\!\rho\!\!\text{ =}\frac{X\pi {{D}^{2}}}{4L}\]where symbols have their usual meaning.
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