Electromagnetic coupling cannot be reduced by ___________(a) shielding(b) wire twisting(c) multiple grounding(d) common groundingI had been asked this question in an interview for internship.This intriguing question originated from Biomedical Signal Analysis and Processing Techniques topic in chapter Recording System of Biomedical Instrumentation

Electromagnetic coupling cannot be reduced by ___________(a) shielding

1.	Electromagnetic coupling cannot be reduced by ___________(a) shielding(b) wire twisting(c) multiple grounding(d) common groundingI had been asked this question in an interview for internship.This intriguing question originated from Biomedical Signal Analysis and Processing Techniques topic in chapter Recording System of Biomedical Instrumentation
Answer» Right ANSWER is (c) multiple GROUNDING For explanation: Having multiple grounds in a single circuit increases the electromagnetic coupling effect by producing ground LOOP which may generate so much noise that it may completely obscure the useful SIGNAL. Thus, the electromagnetic coupling is reduced by shielding, wire twisting and proper grounding which provide a balanced signal pair with satisfactory noise rejection characteristics.

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