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Q.

Three positive point charges q1,q2  and  q3form an isolated system. Suppose the charges have generated a property due to which like charges also attract. The charges are moving along a circle with same speed maintaining angles as shown in figure. The charge  q1 experiences a force f1 due to other two charges. Similarly,  q2 experiences a force f2  and  q3,  a  force  f3. The ratio f1:f2:f3    is

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a

1:1:1

b

q1:q2:q3

c

1:3:2

d

This ratio cannot be calculated

answer is C.

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Detailed Solution

Since the charges exert force on one another that are in action-reaction pair, sum of forces f→1,  f→2  and  f→3 is zero.So force vectors form a triangle, as shown in the figure.Applying sine rule, we havef1sin300=f2sin600=f3sin900or 2f1=2f23=f3=k(suppose)f1=k2,  f2=32k,  f3=kSo f1:f2:f3=12:32:1=1:3:2
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Three positive point charges q1,q2  and  q3form an isolated system. Suppose the charges have generated a property due to which like charges also attract. The charges are moving along a circle with same speed maintaining angles as shown in figure. The charge  q1 experiences a force f1 due to other two charges. Similarly,  q2 experiences a force f2  and  q3,  a  force  f3. The ratio f1:f2:f3    is