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Originally posted by [S]【YU】 at 2006-3-28 00:32:
Q3 , 一個conducting sphere 本身有 equal amount of +ve and -ve charges.
uniformly distributed --> neutral
+ve charged rod 放近, 負既吸埋來,正既彈開去
因為佢地分開左,set up 既 electric field 剛剛抵銷左charged rod的electric field.
所以應該無potential difference.
題目話有 Wo =.=
Originally posted by [S]【YU】 at 2006-3-28 00:32:
complete circuit 唔係無electric field.
應該話,non-resistance components of a complete circuit have no electric field.
我明啦 -.- 我調轉o左 Electric field 同 B-field =..=(尋日太眼訓)
Originally posted by [S]【YU】 at 2006-3-28 00:32:
6. 係呢度接地係冇用的,
由於個circuit本身係short左,
所以所有電流都會行個circuit,
可況,佢即使係earth左,
佢冇provide一個return path,所以earth係度係冇用的
咁係唔係假如係 B 放個燈泡,個燈泡唔會著?
Originally posted by [S]【YU】 at 2006-3-28 00:32:
7. resistance係independent to voltage or current.
第 7 題加o左問題係上面...
我同意 "resistance係independent to voltage or current."
係唔係答案出錯?
Originally posted by [S]【YU】 at 2006-3-28 00:32:
可況呢句 "流過人體的電壓增加",呢句有問題
我想講 p.d across human body -.-"
Originally posted by albie at 2006-3-27 18:53:
6. 係呢度接地係冇用的,
由於個circuit本身係short左,
所以所有電流都會行個circuit,
可況,佢即使係earth左,
佢冇provide一個return path,所以earth係度係冇用的
有無 return path 有咩影響?
唔係就算無 return path, 電流都會不停流向地球嗎?
新增 Q9
[ Last edited by 博士.Dota on 2006-3-28 at 07:16 AM ] |
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