An electric motor best makes use of the fact that on a current-carrying wire in a magnetic field there exists which of these?. A) electromagnetic energy to be tapped.B) rotation.C) All of these.D) a force.E) a changing voltage.
Is this roation or all of these
An electric motor makes use of both rotation and a force that exists on a current-carrying wire in a magnetic field. Therefore, the correct answer is C) All of these.
To understand why, let's break it down:
1. Rotation: An electric motor consists of a coil of wire placed in a magnetic field. When a current flows through the wire, a force is experienced due to the interaction between the magnetic field and the current-carrying wire. This force causes the coil to rotate, resulting in mechanical motion.
2. Force: The force experienced by the current-carrying wire in a magnetic field is known as the Lorentz force. It is given by the equation F = BIL, where F is the force, B is the magnetic field, I is the current, and L is the length of the wire perpendicular to the magnetic field. This force plays a crucial role in the operation of an electric motor.
3. Electromagnetic energy to be tapped: As the coil rotates due to the interaction between the current and the magnetic field, it converts electrical energy into mechanical energy. This mechanical energy can then be used to perform various tasks or generate other forms of energy.
4. Changing voltage: In an electric motor, the motion of the coil induces a voltage across the wire due to electromagnetic induction. This changing voltage is a consequence of Faraday's law of electromagnetic induction and it can be utilized to power other electrical components or be converted into other useful forms of energy.
So, in summary, an electric motor makes use of the fact that on a current-carrying wire in a magnetic field, there exists rotation, a force, electromagnetic energy to be tapped, and a changing voltage.