Which one among the following does NOT have any linkage with the pheno

Which one among the following does NOT have any linkage with the phenomenon of electromagnetic induction ?

Electric transformer

Induction cooker

Galvanometer

Electron microscope

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Answer is Wrong!

This question was previously asked in

UPSC CAPF – 2024

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Electromagnetic induction is the phenomenon where a change in magnetic flux through a circuit induces an electromotive force (EMF) or voltage, which can drive a current. This is described by Faraday’s Law of Induction. An electric transformer works entirely on the principle of mutual induction between coils. An induction cooker heats a metal pan by inducing eddy currents within it using a changing magnetic field, which is a direct application of electromagnetic induction. A galvanometer is a device used to detect and measure electric current. Its operation is typically based on the motor principle: a current-carrying coil placed in a magnetic field experiences a torque, causing it to deflect. This principle is derived from the Lorentz force on moving charges in a magnetic field, and while related to electromagnetism, it is distinct from electromagnetic *induction* (generating voltage/current from changing magnetic fields). An electron microscope uses magnetic lenses to focus beams of electrons. This focusing action is achieved by the Lorentz force exerted by magnetic fields on the moving electrons, not electromagnetic induction. However, considering the options, the galvanometer’s operating principle (motor effect) is most clearly and fundamentally distinct from electromagnetic induction, which is the basis of the transformer and induction cooker. The electron microscope uses magnetic fields to steer charges, a direct application of Lorentz force. Out of C and D, C (Galvanometer) is the most conventional example of a device whose core principle is the motor effect rather than induction.

Electromagnetic induction is the process of generating voltage/current through changing magnetic fields (Faraday’s Law). The motor principle (force on a current in a magnetic field) and the Lorentz force (force on a moving charge in a magnetic field) are related but distinct principles of electromagnetism. Transformers and induction cookers directly rely on electromagnetic induction. A galvanometer primarily relies on the motor principle.

The relationship between the motor principle and electromagnetic induction is linked by Lenz’s Law and energy conservation. However, the fundamental operational principle of a galvanometer is the torque on a current loop, not the generation of current by changing flux.

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