Which of the following obeys Ohm's law?

A boy drags a bag of rice along a smooth horizontal floor with a force of $2 N$ applied at an angle of $60°$ to the floor. The work done after a distance of $3 m$ is

A loaded spring is set in simple harmonic motion, the force that tends to restore the load to its equilibrium position is

A pressure cooker saves both time and fuel in cooking because inside the cooker, the