"What are the undesirable and unwanted effects in the medium?
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Yes, warnings can be ignored. However, it is advised that you do not ignore them, particularly in production (release) code. Treat all warnings as errors and examine each one in turn to determine which can safely be suppressed (documenting your reasoning) and which indicate any unwanted side-effects. Those with unwanted side-effects should be re-written to eliminate those side-effects and thus eliminate the warning.
To cut off unwanted frequencies, unwanted frequencies are called noise.
Do not add any unwanted device in the circuit. Have correct sized wire for the application and the load current.
Floating neutral in 3 phase supply is undesirable as if the same thing occurs then there will be bad effect for all single phase equipment which we are using as phase to neutral voltage will exceed from its normal value and it will harm the equipments.