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Which of the following statements is/are correct? Statements: I) Electromagnet is a device used to convert magnetic field into electrical energy. II) Electromagnet is a device used to convert mechanical energy into magnetic energy.
Statement II only
Neither Statement I nor II
Both Statements I and II
Statement I only
Neither Statement I nor II
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. Therefore, it is a device or arrangement used to convert electrical energy into magnetic energy (and subsequently mechanical energy in applications like relays and motors), making Statement I incorrect and Statement II correct.
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. Therefore, it is a device or arrangement used to convert electrical energy into magnetic energy (and subsequently mechanical energy in applications like relays and motors), making Statement I incorrect and Statement II correct.
Think of an electric doorbell: when you press the button, electricity flows through a wire coil, turning it into a powerful electromagnet that pulls a metal clapper to ring the bell.
EEM: Electricity creates Electromagnetism (Electrical energy to Magnetic energy).
B=╬╝0тАЛnI тАФ Magnetic field inside a long solenoid
E=Electrical┬аEnergyтЖТM=Magnetic┬аEnergy
When an electric current flows through a wire wound into a coil (solenoid), it generates a magnetic field around it. Placing a ferromagnetic core (such as soft iron) inside the coil intensifies the magnetic field drastically. Thus, electrical energy from a power source is transformed into a magnetic field.
An electromagnet requires an electric current flowing through a coil to generate magnetism.
Statement I describes the principle of electromagnetic induction (used in generators), not an electromagnet.
Statement II correctly describes the fundamental energy conversion of an electromagnet.
Magnetic field strength can be easily controlled by adjusting the current.
Can be turned on and off at will.
Requires a continuous source of electrical power to maintain the magnetic field.
Generates heat due to electrical resistance.
Electric bells and relays
MRI machines and particle accelerators
Industrial cranes used for lifting heavy iron scrap
Electromagnets use soft iron cores because soft iron has high magnetic permeability and low retentivity.
Option B is the correct choice as only Statement II is factually correct regarding electromagnets.
B is correct тАФ Statement II only is correct as an electromagnet converts electrical energy into magnetic energy, whereas Statement I describes electromagnetic induction.
Always distinguish between electromagnetic induction (mechanical/magnetic to electrical, as in generators) and current carrying conductors/electromagnets (electrical to magnetic).
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