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[Phy] galvanometer and induced current/emf

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galvanometer and induced current/emf

我想問galvanometer既指針 指向左同指向右 係depend on 咩??
current 既流動方向 ??定係正負極既接駁????


幾時[what condition]係induced current 幾時係induced emf ?兩者有冇分別???
   

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direction of current flow

both will be induced if you are talking about electromagnetic induction

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回覆 #1 dvg311420 的帖子

1. depend on the direction of current flow.
2. I state an exmaple :


From the figure, the magnetic field is point into the paper. A metal rod is moving to the right with constant speed.
Are there any induced current flow on the metal rod ?

Ans: There are no induced current flow on the metal rod. However, when the metal rod is cutting the magnetic field line,
according to the Fleming's right hand rule, there are induced e.m.f or induced voltage on the metal rod.
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回覆 #3 ngkin 的帖子

current direction=galvanometer direction??
即係話係中間行緊[no change in magnetic field ]都有induced emf???

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1. 對

2. 簡單咁講, 目前你可以將 electromagnetic force 當成 voltage
因為枝 Rod 唔係完整電路, 所以無電流被感生, 但是依然有 induced voltage。
無Current 不代表無 Voltage !


加油

[ 本帖最後由 ngkin 於 2010-4-18 09:36 AM 編輯 ]
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回覆 #5 ngkin 的帖子

thx!!!!!!!!!!!

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