Question

A circular ring is 5 cm wide. The difference of outer and inner radius is

• A. $5cm$
• B. $2.5cm$
• C. $10cm$
• D. none of these

Answer 1

The correct option is A $5cm$

Since, we are given width of a circular ring which is nothing but a difference of radii the outer and inner circle.

Hence, $R-r=5cm$.