两个重力均为mg的带电球A和B,用绝缘细线1和2悬挂,如右图,已知AB间库仑力大小恰好为mg,当两球带异种电荷时,细线1和2的张力T1和T2分别为2mg 和0为什么T2是0,A对B有库仑力,B对A也有库仑力,那不就

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