यह साइट खासकर के प्रैक्टिस के लिए है, इसलिए अधिकतर प्रश्नो के उत्तर नहीं दिए गए हैं| आप उत्तर देके मदद कर सकते हैं अपनी और दूसरों की भी

A bimetal made copper and iron strips welded together is straight at room temperature. It is held vertically with iron strip towards left and copper strip towards right. If this bimetal is heated ! it will

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