You can't use iron filings to check presence of electricity. There's way to check presence of electricity.
Test pen
When the test pen touch to the conductor,the light in test pen will glow. This means there's presence of electricity.
Test Lamp
When the live and neutral wire are connected to check the out going current, the lamp will glow to show there's is presence of electricity.
Electric Voltage Detector
Multi Meter
Place positive prob to live and negative prob to neutral and turn the range to AC voltage. The multi meter will show the current rating and the presence of electricity.
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