Q.
The radius of a thin wire is 0.16 mm. The area of cross-section of wire in mm2 with correct number of significant figures is
2929
213
JIPMERJIPMER 2013Physical World, Units and Measurements
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Solution:
Here, R = 0.16 mm
Hence, A=πR2 =722×(0.16)2=0.080457mm2
Since radius has two significant figures so area also will have two significant figures. ∴A=0.080mm2