Topic: Electronics Engineering
A straight line and circle of radius are given. A chord is drawn at random to this circle parallel to the given line. Expected length of the chord is
- A. 2a
- B. $\pi a$
- C. $\pi a/2$
- D. None of these
Answer: C. $\pi a/2$
Explanation: A chord must be always less than the diameter, so expected length of the chord is less than 2a. $\frac{\pi a}{2}=1.57a<2a$. So, correct option is $\frac{\pi a}{2}$.