DC Motor: Rotating Coil in Magnetic Field

[Ry122]

The diagram shows a DC electric motor containing a rectangular coil of 20 turns and of length .50m and width .40m The coil is pivoted so that it can rotate freely on an axle. The coil is shown lying horizontally in a magnetic field of uniform stength .60T. A current of 3.5A is passing through the coil in the direction PQRS.
Im totally lost with this one. Don't know where to start.

 

[DAKONG]

find couple moment?

 

[m2003]

I can explain the concept of a DC motor and how it works based on the given information.

A DC motor is a type of electric motor that converts electrical energy into mechanical energy through the interaction of a magnetic field and electric current. The key components of a DC motor are a stator (stationary part) and a rotor (rotating part). In this case, the rectangular coil represents the rotor, which is pivoted on an axle and can rotate freely.

The magnetic field, with a strength of 0.60T, is created by the stator. When a current of 3.5A is passed through the coil in the direction PQRS, it creates a force on the coil, causing it to rotate. This is because when an electric current flows through a conductor in a magnetic field, it experiences a force known as the Lorentz force.

The number of turns in the coil (20 turns) and its dimensions (length of 0.50m and width of 0.40m) also play a role in the motor's performance. The more turns in the coil, the stronger the magnetic field and the greater the torque (rotational force) produced. The dimensions of the coil also determine the size and weight of the motor, as well as its speed and power.

Overall, the DC motor works by using the interaction between an electric current and a magnetic field to produce rotational motion. It is a fundamental concept in electromechanical systems and is commonly used in various applications such as fans, pumps, and electric vehicles.