Question

A chapati maker is a machine which converts balls of dough into chapattis. What effect of force comes into play in this process?
A. Compressive force
B. Expansive force
C. Electric force
D. Magnetic force

Answer 1

Hint : Pressure is defined as the force acting per unit area. Note that the pressure has an inverse with the area. So, the area is smaller and larger the pressure on a surface. Chapatti maker works on this principle. The balls of dough become chapattis by this large amount of pressure. The given question is related to the application of a machine that converts balls of dough into chapattis.

Complete step-by-step solution:
In the given question, we’ve to discuss the application of a machine referred to as chapati maker and what effect of the force applied comes into play in the process of making the chapatis from the balls of dough. There are different effects of force that may be seen in our day-to-day life. To find the effect of force that comes into play within the given situation, we’ve to first understand clearly what the force does.
Compressive force - When we apply a tangential force on the body the shape and also volume of the body will be changed. When the compression stress has applied the body length is reduced. But here the ball of dough is expanded. So, option A is incorrect.
Expansive force - The force applied by the machine converts the balls of dough into flat round chapatis. So, the ball of the dough is expanded because the force is applied to it to get into a flat round shape of a chapati. Hence, the effect of force that comes into play in this process is Expansion force. So, option B is correct.
Electric force - The attractive electrostatic force between two charged particles is far stronger than the gravitational force being exerted between two solid particles. The electric force is one of the basic forces of this universe. So, option C is incorrect.
Magnetic force- It means a charged particle is moving in a direction parallel to that of the magnetic field. At this moment, a charge experiences no force.
So, option D is incorrect.

Note: When two inner surfaces of a chapati maker are pressed against each other with the use of electrical energy supplied from an electrical outlet, this electrical energy turns into heat energy. A large amount of mechanical force by heat creates the needed pressure to change the spherical dough into flat-shaped chapattis. The heat energy is then further used to cook the chapattis into the final edible form.