Question

Three rigid rods are joined to form an equilateral triangle ABC of side $1\mathrm{m}$. Three particles carrying charges $20\mathrm{\mu C}$ 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 magnitude.

• A. zero
• B. $3.6\mathrm{N}$
• C. $3.6\surd 3\mathrm{N}$
• D. $7.2\mathrm{N}$

Answer 1

The correct option is A

zero

Step 1: Given data

Equilateral triangle ABC of side $1\mathrm{m}$.

Three particles carrying charges $20\mathrm{\mu C}$.

Step 2: Concept used

Write the expression for net force is ${\mathrm{F}}_{\mathrm{net}}=\mathrm{ma}$.

Here,

m is the mass.

a is the acceleration.

Step 3: Calculate force

It will experience force because of the other two particles but the net resultant force on A will be zero since the acceleration of the charged particle is zero because the system is at rest.

The net force will also be zero

${\mathrm{F}}_{\mathrm{net}}=0$.

Hence, option(A) is correct.