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A charge Q is placed at each of the opposite corners of a square. A charge q is placed at each of the other two corners. If the net electrical force on Q is zero, then Q / q equals is ?

A charge Q is placed at each of the opposite corners of a square. A charge q is placed at each of the other two corners. If the net electrical force on Q is zero, then Q / q equals is ?

Grade:11

1 Answers

Arun
25758 Points
2 years ago
The net force on q at one corner is zero if F1+F2+F3=0
or F1cos45oi^F1sin45oj^F2j^+F3i^=0   
so, F1cos45o=F3....(1) and F1sin45o=F2....(2)
using (1) , (2a)2kq2×21=a2kqQ
or q=22Q

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