Three rigid rods are joined to form an equilateral triangle ABC o… - Vidyadip

MCQ

Three rigid rods are joined to form an equilateral triangle $\text{ABC}$ of side $1m.$ Three particles carrying charges $20\mu\text{C}$ 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 at $A$ has the magnitude:

✓
Zero
B
$3.6N$
C
$3.6\sqrt{3}\text{N}$
D
$7.2N.$

✓

Answer

Correct option: A.

Zero

Using, $F_{\text {net }}=\mathrm{ma}$,
$a=0 \Rightarrow F_{\text {net }}=0$
As the whole system is at rest, the resultant force on the charged particle at $A$ is zero.

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