A student had heard that rainwater is as good as distilled water. So, he collected some rainwater in a clean glass beaker and tested it. To his surprise he found that the compass needle showed deflection. What could be the reason ?
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The rainwater falling through the atmosphere dissolves some acidic gases such as carbon dioxide, sulphur dioxide and nitrogen oxides and hence becomes acidic. This acidic rainwater conducts electric current which produces magnetic field and deflects the compass needle.