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তড়িৎ সংক্রান্ত কোন সমীকরণটি সঠিক নয়?

E = \frac{σ}{\in_{0}}

F = qE

E = \frac{1}{4 π \in_{0}} \times \frac{q}{{}_{r}2}

F = \frac{1}{4 π \in_{0}} \times \frac{q_{1} q_{2}}{d}

ANS : 4

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