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A particle of charge \( \mathrm{q} \) and mass \( \mathrm{m} \) starts moving from the origin under the action of an electric field \( \overrightarrow{\mathrm{E}}=\mathrm{E}_{0} \hat{\mathrm{i}} \) and magnetic field \( \overrightarrow{\mathrm{B}}=\mathrm{B}_{0} \mathrm{k} \). Its velocity at \( (x, 3,0) \) is \( (4 \hat{i}+3 \hat{j}) \). The value of \( x \) is
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