Discussion
The principle of transformer is
Answer: B
A transformer works on the principle of mutual induction: a changing current in the primary coil induces a voltage in the secondary coil, option B.
Self induction is the effect in a single coil, Lenz's law gives the direction of the induced current, and Fleming's right hand rule is the rule for a generator.
A transformer has a primary and a secondary coil wound on the same iron core. When an alternating current flows in the primary, the changing magnetic flux induces a voltage in the secondary, which is mutual induction. This is why transformers work only with alternating current.
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