85问答库 > 匀强电场的场强E=4V⼀m，方向水平向左，匀强磁场的磁感应强度

匀强电场的场强E=4V⼀m，方向水平向左，匀强磁场的磁感应强度

2025-03-15 19:39:44
推荐回答（1个）
回答1：

(1)
N点离开墙壁说明此时电场力等于磁场力
qE=q(vN)B
所以VN=2m/s
根据动能定理：mgh-W=1/2m(vN)^2
代入数字可得:W=6*10^-3J
(2)
运动到P点时,三力平衡,速度向右上方向(与水平方向成45度角),所以磁场力向左上(与水平方向
成45度角)
q(vP)B=2^1/2mg
mg=qE
联立以上两式可得:q=1/400
vP=2*2^1/2
对N到P应用动能定理：mg(H-h)-qEs=1/2m(vP)^2-1/2m(vN)^2
(H=1.6m)
代入数字可得:s=0.6m.

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