defence exam CISF Head Constable Ministerial (HCM) & ASI Steno Mock Test Series General Science Physics Laws and Principles

वर्ष 2020 प्रसिद्ध ओरस्टेड प्रयोग के nवें वर्ष को दर्शाता है, जहां n किसके बराबर है:

1
150
2
125
3
100
4
200
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