Ans: Magnetic fields play a crucial role in devices like transformers. Transformers use magnetic fields to transfer electrical energy between two coils of wire.
When an alternating current (AC) flows through the primary coil, it creates a changing magnetic field. This magnetic field induces an alternating voltage in the secondary coil due to the electromagnetic induction principle.
The voltage can be stepped up or down depending on the ratio of turns in the primary and secondary coils. This allows transformers to efficiently transmit electricity over long distances and adapt voltage levels for safe use in homes and industries. Magnetic fields are essential in this process to enable the efficient transfer of electrical energy.