As copper rod weighing 0.14 kg, lying across the

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As copper rod weighing 0.14 kg, lying across two rails spaced 0.3 m each item another pass current 50 A. The coefficient of sliding friction rod on rails 0.6. What is the minimum value of the magnetic field, which can cause sliding rod, and what is the direction of the current?

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Task 30762. Detailed solution shorthand terms, formulas, laws used in the decision, the withdrawal of the calculation formula and the response.
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