When you pull out the plug connected to an electrical appliance, you often observe a spark. To which property of the appliance is this related ?

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Q: 94 (CDS-II/2011)
When you pull out the plug connected to an electrical appliance, you often observe a spark. To which property of the appliance is this related ?
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question_subject: 

Science

question_exam: 

CDS-II

stats: 

0,10,29,9,10,16,4

keywords: 

{'electrical appliance': [0, 0, 0, 1], 'inductance': [0, 0, 1, 2], 'appliance': [0, 0, 0, 2], 'spark': [0, 0, 0, 1], 'capacitance': [0, 0, 0, 1], 'plug': [0, 0, 0, 1], 'wattage': [0, 0, 0, 1], 'resistance': [0, 0, 1, 2], 'property': [15, 0, 8, 22]}