Physics: Post your doubts here!

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A small charge q is placed in the electric field of a large charge Q.
Both charges experience a force F.
What is the electric field strength of the charge Q at the position of the charge q?

A) F/(Qq)

B) F/Q

C) FqQ

D) F/q

Answer is D, why isn't it B? :O HELP
 
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A small charge q is placed in the electric field of a large charge Q.
Both charges experience a force F.
What is the electric field strength of the charge Q at the position of the charge q?

A) F/(Qq)

B) F/Q

C) FqQ

D) F/q

Answer is D, why isn't it B? :O HELP


Solution 596
 
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[QUOTE =“ kandelbiz,帖子:131649,成员:4642”]
回复:物理在这里帮助!卡在某个地方?在这里问!:)

在8分钟的时间内,3.6 * 10 ^ 16的氯(Cl-)离子在阳极被中和并释放,而1.8 * 10 ^ 16的铜(Cu2 +)离子被中和并沉积在阴极上。
1.计算此时通过电解质的总电荷
[/引用]
 
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IMG_20210223_023324.jpgcan anyone explain Q11 (b) (i)? I read an explanation somehwere and it said that the two forces have to be subtracted because they are opposite in direction. Why subtract when both forces are in same direction? Shouldn't we add? Both springs will exert a force to the left to bring it to the equilibrium position right?
 
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