Ask Questions, Get Answers

Want to ask us a question? Click here
Browse Questions
Home  >>  JEEMAIN and AIPMT  >>  Physics  >>  Class11  >>  Units and Measurement
0 votes

What is the area of the cross section of the wire up to approximate significant figures if the radius of a uniform wire is 0.021 cms. The value of $\pi$ is given to be 3.142.

Can you answer this question?

1 Answer

0 votes
The area $ = \pi r^2 =3.142 \times 0.021^2 = 0.00138562\;cm^2$
Since there are only two significant digits in the radius, the area must also be rounded off to two digits, hence the Area with the appropriate rounding off $ = 0.0014\;cm^2$
answered Jul 12, 2014 by balaji.thirumalai

Related questions

Ask Question
student study plans
JEE MAIN, CBSE, AIPMT Mobile and Tablet App
The ultimate mobile app to help you crack your examinations
Get the Android App