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Newton’s Laws of Motion — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysicsNewton’s Laws of Motion1 Mark
Question
Three rigid rods are joined to form an equilateral triangle 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:
  1. Zero
  2. 3.6N
  3. $3.6\sqrt{3}\text{N}$
  4. 7.2N.
✓

Answer

  1. Zero

Explanation:

Using, Fnet = ma,

a = 0 ⇒ Fnet = 0

As the whole system is at rest, the resultant force on the charged particle at A is zero.

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