শ্রেণি: একাদশ, বিষয়: পদার্থবিজ্ঞান দ্বিতীয় পত্র, অধ্যায়: স্থির তড়িৎ (২),মোঃ ফজলুল বারী ( বারী স্যার), প্রভাষক পদার্থবিজ্ঞান বিভাগ, পুলিশ লাইন্স স্কুল এন্ড কলেজ রংপুর

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