A block of mass `m` fitted with a light spring of stiffness k and natural length `l_(0)` kept on a smooth radial groove made on a disc rotaing with a constant angular axis . If the block is released slowly . Find the maximum elongation of the spring

Options

A. ` 2 l_(0) sqrt(4 pi epsilon_(0) k (l_(0) + x))`
B. ` 2 xsqrt(4 pi epsilon_(0) k (l_(0) + x))`
C. ` 2 (l_(0) + x)sqrt(4 pi epsilon_(0) k x)`
D. ` (l_(0) + x)sqrt(4 pi epsilon_(0) k x)`

Answer

C

Explanation

For maximum elongation charges on the blocks must be equal to Q/2 on each block .