Question

Which one of the following energies cannot be possessed by a body at rest?
A. Potential energy
B. Kinetic energy
C. Thermal energy
D. Magnetic energy

Answer 1

Hint: To solve this question, we will Identify the energy which will be associated with a body in motion.

Complete step-by-step solution:
We know there are various forms of energy that we come across our day to day life. There are different types of parameters related to each different form. Some are associated with velocity or speed of the body at which it is moving with, while some are associated with its mass or its position. Some are again associated with the field it experiences around.
In the above question, there are four types of energies which are mentioned. So to proceed for the same, it is important that you should know about them along with the parameters associated with them, all along.

Potential energy: Potential energy, in physics, is the energy that an object retains because of its location relative to other objects, stresses within itself, its electric charge or other factors. This energy can be calculated by the product of mass, acceleration due to gravity and the height at which the object is.

Kinetic energy: In physics, an object's kinetic energy is the energy that it absorbs because of its movement. It is defined as the work that is necessary to accelerate a body of a given mass from rest to its specified speed. The body, having acquired this energy during its acceleration, retains this kinetic energy until it changes its speed.

Thermal energy: Thermal energy (also known as heat energy) is generated when an increase in temperature causes atoms and molecules to move more quickly and collide. The energy that comes out of the heated substance's temperature is called thermal energy.

Magnetic energy: It is an energy source of electrical as well as magnetic components. It is generated when one runs a magnetic current, producing a magnetic field, through a wire or some other conductive material.

From the above discussion, it is clear that kinetic energy is possessed by a body by the virtue of its motion, which cannot be observed on a body that is at rest. To possess kinetic energy, a body must be in motion.

Hence, the correct option is (B).

Note: In the above question, we need to find out the energy which cannot be possessed by a body at rest. Except for kinetic energy, all the three types can be possessed by a body at rest. Higher the velocity of the body, higher is its kinetic energy.