Question

With the increase in diameter of the rotor, the effective RCF (relative centrifugal force) at a fixed RPM (revolutions per minute) will

• A. Remain unaffected
• B. lncrease
• C. Decrease
• D. Be lower at the bottom of centrifuge tube

Answer 1

Answer: (B)

lncrease

Centrifugal force is the force exerted on the contents of the rotor that aids in the separation of aqueous solution at a particular RPM. This force is equally opposite of the centripetal force acting on the rotor which is measured by an equation

F =mω2r, where m represents the mass of rotor, r is the radius of rotor and ω is the angular frequency.

So the diameter of the rotor (2r) is directly proportional to F, so as the diameter increases, centripetal force increases which is equal to the centrifugal force.