railway RRB Group D Mock Test Series 2024-25 Physics Electromagnetic Waves

তড়িৎচুম্বকীয় তরঙ্গ ___________ প্রকৃতির।

1
ধনাত্মক 
2
নিরপেক্ষ
3
ঋণাত্মক 
4
উপরের সবগুলো
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