Which of the following statements are true?

Options

A. Power is proportional to voltage only
B. Power is proportional to current only
C. Power is neither proportional to voltage nor to the current
D. Power is proportional to both the voltage and current

Answer

C

Explanation

Here weight of rod produces torque on the rod
`therefore tau=mgxx(l)/(2)`
also, `tau=I.alpha`, where I is the moment of inertia
`therefore mg""(l)/(2)=I.alpha`
Now, `I=(ml^(2))/(3)`
`mg""(l)/(2)=(ml^(2))/(3).alpha`
`therefore alpha=(3g)/(2l)`