Q. The radius of a wire is 0.24 mm. Then its area of cross section by taking significant figures into consideration is
A) 0.1 $mm^{2}$
B) $0.2\ mm^{2}$
C) $0.18\ mm^{2}$
D) $0.180\ mm^{2}$
Explanation
Area of cross section $= \frac{22}{7} \times 0.24 \times 0.24mm^{2} = 018mm^{2}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.