如图所示,处于磁场中的两根足够长、电阻不计的平行光滑金属导轨相距1 m,导轨平面与水平面成 θ=30°角,下端连接阻值为R=10 Ω的电阻。磁场方向与导轨平面垂直,其大小B=0.5 T,质量为m=0.2 kg、电阻不计的金属棒放在两导轨上,棒与导轨垂直并保持良好接触(g取10 m/s 2 )。(1)求金属棒沿导轨由静止开始下滑时的加速度大小是多少 m/s 2 ;(2)当金属棒下滑速度达到稳定时,求该速度的大小是多少m/s。
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A.
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