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Why is a permanent magnet necessary for an electric motor to function effectively?
A permanent magnet is necessary for an electric motor to function effectively because it creates a magnetic field that interacts with the electric current flowing through the motor's coils, causing the motor to generate rotational motion. This interaction between the magnetic field of the permanent magnet and the electric current is essential for the motor to convert electrical energy into mechanical energy efficiently.
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What are the differences between electromagnets and permanent magnets, and how do they function differently?
Electromagnets are temporary magnets created by passing an electric current through a coil of wire, while permanent magnets are naturally occurring magnets that retain their magnetism without an external power source. Electromagnets can be turned on and off by controlling the electric current, while permanent magnets always have a magnetic field.
Is the magnet in a compass a permanent magnet or a electromagnet?
The magnet in a compass is a permanent magnet. Its magnetic field aligns with the Earth's magnetic field, allowing the compass needle to point north.
What is the basis of the function of a galvanometer?
The function of a galvanometer is based on the interaction between a magnetic field and an electric current passing through a coil of wire. When a current flows through the coil, it creates a magnetic field that interacts with a permanent magnet, causing a deflection of the needle on the galvanometer scale.
What is the significance of the electric field in a capacitor?
The electric field in a capacitor plays a crucial role in storing and releasing electrical energy. It helps to create a potential difference between the two plates of the capacitor, allowing it to store charge and store energy. This electric field is essential for the capacitor to function effectively in various electronic circuits and devices.
How simple motor works?
A simple motor works by passing an electric current through a coil of wire, creating a magnetic field. This magnetic field interacts with a permanent magnet to generate a force that causes the coil to spin. This spinning motion is what drives the motor to perform its function.
