The minimum speed for a particle at the lowest point of a vertical circle of radius 𝑟, to describe the circle is 𝑣. If the radius of the circle is reduced to one-fourth its value, the corresponding minimum speed will be

Question : The minimum speed for a particle at the lowest point of a vertical circle of radius 𝑟, to describe the circle is 𝑣. If the radius of the circle is reduced to one-fourth its value, the corresponding minimum speed will be