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কাঁচের ধনাত্মক আধান এবং রেশমে ঋনাত্মক আধান সৃষ্টি হয়।
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কাঁচের ধনাত্মক আধান এবং রেশমে ঋনাত্মক আধান সৃষ্টি হয়।