电磁感应中电荷量和热量怎么求？有哪些方法啊 电磁感应中电荷量和热量怎么求
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1.
用经验公式blx/r总
来求，只需解出位移即可（电阻需恒定，也可用磁通量的变化量对时间来求）
2.
用回路中电流随时间的平均值来求，即可用i-t图像的围成面积，用数学方法来求
3.
利用σiδt=q来求，一般需解出速度的变化量等，
4.
用动量定理来求
热量
1用能量守恒定律来求，算出金属棒的位移，速度等
2若回路中电流，电阻恒定可用q=i2r't来求，若为纯电阻线路也可用uit等来求
3用安培力的平均值来求，需知道位移
4若是接电源的电路可用q=eiσδt-δek来求（光滑）
一般来说，在闭合回路中单根导体杆切割磁感线时若导轨光滑，回路中生热即为其机械能的减少量，也为安培力做负功，回路中的电热
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