JEE Main 2019 (Online) 12th January Morning Slot | Electrostatics Question 222 | Physics

Determine the electric dipole moment of the system of the three charges, placed on the vertices of an equilateral triangle, as shown in the figure :

JEE Main 2019 (Online) 12th January Morning Slot Physics - Electrostatics Question 222 English

JEE Main 2019 (Online) 12th January Morning Slot Physics - Electrostatics Question 222 English

$$2q\ell \widehat j$$

$$\left( {q\ell } \right){{\widehat i + \widehat j} \over {\sqrt 2 }}$$

$$\sqrt 3 \,q\ell {{\widehat j - \widehat i} \over {\sqrt 2 }}$$

$$ - \sqrt 3 \,q\ell \widehat j$$

JEE Main 2019 (Online) 11th January Evening Slot

MCQ (Single Correct Answer)

-1

An electric field of 1000 V/m is applied to an electric dipole at angle of 45^o. The value of electric dipole moment is 10^–29 C.m. What is the potential energy of the electric dipole?

- 7 $$ \times $$ 10^–27 J

$$-$$ 9 $$ \times $$ 10^–20 J

$$-$$ 10 $$ \times $$ 10^–29 J

$$-$$ 20 $$ \times $$ 10^–18 J

JEE Main 2019 (Online) 11th January Morning Slot

MCQ (Single Correct Answer)

-1

Three charges Q, + q and + q are placed at the vertices of a right-angle isosceles triangle as shown below. The net electrostatic energy of the configuration is zero, if the value of Q is :

JEE Main 2019 (Online) 11th January Morning Slot Physics - Electrostatics Question 225 English

JEE Main 2019 (Online) 11th January Morning Slot Physics - Electrostatics Question 225 English

$${{ - q} \over {1 + \sqrt 2 }}$$

+ q

$$-$$ 2q

$${{ - \sqrt 2 q} \over {\sqrt 2 + 1}}$$

JEE Main 2019 (Online) 11th January Morning Slot

MCQ (Single Correct Answer)

-1

The given graph shows variation (with distance r form centre) of :

JEE Main 2019 (Online) 11th January Morning Slot Physics - Electrostatics Question 224 English