Question

A ring of radius $R$ and mass $M=2kg$ has change $q_1=+2C$ and $q_2=-2C$ on diametrically opposite points. It remains in equilibrium on a rough inclined plane in the presence of uniform electric filed $E$, then magnitude of $E$is

• A. $10v/m$
• B. $20v/m$
• C. $5v/m$
• D. $2v/m$

Answer 1

The correct option is A $10v/m$

Radius $=R$

mass $=M=2kg$

$q_1=2C$

$q_2=-2C$

Now, $E=\frac{mg}{2q}=\frac{2\times 10\times 2}{2\times 2}=10V/m$