Question

The external and internal radius of a hollow cylinder are measured with the help of vernier callipers. Their values are $4.23\pm 0.01cm$ and $3.87\pm 0.01cm$ respectively. The thickness of the wall of the cylinder is:

• A. $0.36\pm 0.02cm$
• B. $0.18\pm 0.02cm$
• C. $0.36\pm 0.01cm$
• D. $0.18\pm 0.01cm$

Answer 1

The correct option is A $0.36\pm 0.02cm$

Mean thickness$=4.23-3.87=0.36cm$

Errors will add up so error$=0.01+0.01=0.02cm$

So answer is $0.36\pm 0.02cm$