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प्रश्न
A charge Q is divided into two parts of q and Q – q. If the coulomb repulsion between them when they are separated is to be maximum, the ratio of Q/q should be ______.
पर्याय
2 : 1
1/2
4 : 1
1/4
MCQ
रिकाम्या जागा भरा
उत्तर
A charge Q is divided into two parts of q and Q – q. If the coulomb repulsion between them when they are separated is to be maximum, the ratio of Q/q should be 2 : 1.
Explanation:
Let separation between two parts be r, then
F = `("k"."q"("Q"-"q"))/"r"`,
For F to be maximum `"dF"/"dq"` = 0 then `"Q"/"q" = 2/1` = 2 : 1
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