Teaching Bihar STET Paper 1 (माध्यमिक) Mock Test 2024 General Science Physics Current Electricity

ভ্যাকুয়ামে ইলেক্ট্রোম্যাগনেটিক তরঙ্গের বেগ হল:

1
2 x 10 8 ms -1
2
3 x 10 8 ms -1
3
2 x 10 5 ms -1
4
3 x 10 5 ms -1
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