Electrostatics Question 682
Three charges +q, +2q and +4q are connected by string. What is ratio of tension in the strings AB and BC?
Options:
A) 1 : 2
B) 1 : 3
C) 2 : 1
D) 3 : 1
Show Answer
Answer:
Correct Answer: B
Solution:
$ T _{AB}=\frac{kq\cdot 2q}{d^{2}}+\frac{kq\cdot 4q}{{{( 2d )}^{2}}}=\frac{3kq^{2}}{d^{2}} $
$ T _{BC}=\frac{k\cdot 4q\cdot 2q}{d^{2}}+\frac{kq\cdot 4q}{{{( 2d )}^{2}}}=\frac{14kq^{2}}{d} $
BETA
