BITSAT 2021 | Electrostatics Question 6 | Physics

Four charges equal to + Q are placed at the four corners of a square and a charge ($$-$$q) is at its centre. If the system is in equilibrium, then the value of $$-$$q is

$$ - {Q \over 4}(1 + 2\sqrt 2 )$$

$${Q \over 2}(2\sqrt 2 + 1)$$

$${Q \over 4}(1 + 2\sqrt 2 )$$

$${Q \over 4}(1 + \sqrt 2 )$$

BITSAT 2021

MCQ (Single Correct Answer)

-1

An electric dipole is placed at an angle of 30$$^\circ$$ in a non-uniform electric field. The dipole will experience

torque only

translational force only in the direction of the field

translational force only in a direction normal to the direction of the field

torque as well as a translational force

BITSAT 2020

MCQ (Single Correct Answer)

-1

A charge +q is placed at the origin O of XY-axes as shown in the figure. The work done in taking a charge Q from A to B along the straight line AB is

BITSAT 2020 Physics - Electrostatics Question 6 English

$${{qQ} \over {4\pi {\varepsilon _0}}}\left( {{{a - b} \over {ab}}} \right)$$

$${{qQ} \over {4\pi {\varepsilon _0}}}\left( {{{b - a} \over {ab}}} \right)$$

$${{qQ} \over {4\pi {\varepsilon _0}}}\left( {{b \over {{a^2}}} - {1 \over b}} \right)$$

$${{qQ} \over {4\pi {\varepsilon _0}}}\left( {{a \over {{b^2}}} - {1 \over b}} \right)$$

BITSAT 2020

MCQ (Single Correct Answer)

-1

Two small conducting spheres of equal radius have charges +20 $$\mu$$ C and $$-$$40 $$\mu$$C respectively and placed at a distance R from each other experience for F₁. If they are brought in contact and separated to the same distance, they experience force F₂. The ratio of F₁ to F₂ is

1 : 4

+8 : 1

$$-$$8 : 1

1 : 8

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