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Inspiron 15 has audio and electrical issue when charging

My laptop, dell inspiron 15 7567, intel i5 7300 HQ with nvidia gtx 1050ti 4GB GDDR5, 8GB DDR4 RAM, 128GB of SSD, 500GB HDD, bought on November 14, 2017. The performance is solid, though I do have some old problem that started to annoy me:

1st. My laptop usually had this weird static noise whenever I plug the charger in outlet, the static also very audible from my earphone. I though this was normal at first , but a few months of use prove it was rather annoying for me. The noise will be gone whenever I put my finger on the speaker metal railing or any metal parts of my laptop

2nd By touching my speaker I can feel this electricity on it and sometimes when I'm using the keyboard the electricity could randomly zap my arm

Is there anything I can do?

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