Answer: B. Magnetically
The primary and secondary winding of a transformer are electrically separated but magnetically connected through a common magnetic core.
Transformer is an electrostatic device, which consists of two are more electric circuits (or) windings, these windings are separated electrically but interlinked magnetically by a common magnetic core. Transformer is used to transfer electrical energy from one alternating-current circuit to another through the common magnetic core at the same frequency.
So, the primary and secondary winding of a transformer are magnetically coupled.
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