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Three rigit rods are joined to form an equilaterla triangle ABC of side 1 m. Three particles carrying charges `20 muC` each are attached to the vertices of the triangle. The whole system is at rest in an inertial frame. The resultant force on the charged particle. A has the magnitude.

A

zero

B

3.6N

C

`3.6sqrt3N`

D

7.2N

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The correct Answer is:
A
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