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Confusion while diagnosing an open ground

I have an outlet tester and it says the outlet in my bathroom has an open ground and I'm trying to see if I can fix this by replacing the receptacle or if the problem is elsewhere. With a voltage ...
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2answers
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What is an open ground and why would the neutral wire measure 50v?

What is an open ground? Also, why would there be 50 V in the neutral and ground wires? I have replaced all outlets and switches and still I have no light.