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Physics, 26.07.2021 14:50 justaguy15

: Một thanh kim loại chiều dài nằm ngang có thể trượt không ma sát trên hai thanh ray bên dưới như trong hình bên. Tác dụng một lực N lên thanh làm cho nó chuyển động đều với vận tốc 2,0 m/s trong từ trường có chiều như hình vẽ. Xác định: a) Cường độ dòng điện chạy qua điện trở

b) Công suất tỏa nhiệt trên điện trở.

c) Công suất của lực .

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