According to the second Newton's law, gravitational force and Lorenz force must compensate each other.
"mg = qE"
"\\displaystyle E=\\frac{mg}{q}= \\frac{3 \\cdot 9.81}{5}=5.886 \\approx 5.9 \\, \\frac{V}{m}"
Answer: "5.9 \\, \\frac{V}{m}"
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