Which of the following options is true? (a) Moving electric charges...

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Which of the following options is true?
(a) Moving electric charges produce magnetic
\( \mathrm{P} \) fields.

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(b) The phenomenon of generating current or e.m.f. by changing magnetic fields is called electromagnetic induction.
(c) Generators, transformers etc works on the principle of electromagnetic induction.
(d) All of these.
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