Charges Q1, Q2, and Q3 are at (-d,0), (0,0), and (d,0). Q1=Q3, Q2>0. Find the nature and value of Q1 for zero potential energy.
Show Hint
Solution and Explanation
Top Questions on Electrostatics
- For a short dipole placed at origin \( O \), the dipole moment \( P \) is along the \( x \)-axis, as shown in the figure. If the electric potential and electric field at \( A \) are \( V_0 \) and \( E_0 \) respectively, then the correct combination of the electric potential and electric field, respectively, at point \( B \) on the \( y \)-axis is given by:
- JEE Main - 2025
- Physics
- Electrostatics
- The electrostatic potential on the surface of a uniformly charged spherical shell of radius \( R = 10 \, \text{cm} \) is 120 V. The potential at the centre of the shell, at a distance 5 cm from the centre, and at a distance 15 cm from the centre of the shell are:
- JEE Main - 2025
- Physics
- Electrostatics
Match List - I with List - II:
List - I:
(A) Electric field inside (distance \( r > 0 \) from center) of a uniformly charged spherical shell with surface charge density \( \sigma \), and radius \( R \).
(B) Electric field at distance \( r > 0 \) from a uniformly charged infinite plane sheet with surface charge density \( \sigma \).
(C) Electric field outside (distance \( r > 0 \) from center) of a uniformly charged spherical shell with surface charge density \( \sigma \), and radius \( R \).
(D) Electric field between two oppositely charged infinite plane parallel sheets with uniform surface charge density \( \sigma \).List - II:
(I) \( \frac{\sigma}{\epsilon_0} \)
(II) \( \frac{\sigma}{2\epsilon_0} \)
(III) 0
(IV) \( \frac{\sigma}{\epsilon_0 r^2} \) Choose the correct answer from the options given below:- JEE Main - 2025
- Physics
- Electrostatics
- An electric dipole is placed at a distance of 2 cm from an infinite plane sheet having positive charge density \( \sigma \). Choose the correct option from the following.
- JEE Main - 2025
- Physics
- Electrostatics
- A point charge causes an electric flux of \( -2 \times 10^4 \, \text{Nm}^2\text{C}^{-1} \) to pass through a spherical Gaussian surface of 8.0 cm radius, centered on the charge. The value of the point charge is:
- JEE Main - 2025
- Physics
- Electrostatics
Questions Asked in CBSE CLASS XII exam
A certain reaction is 50 complete in 20 minutes at 300 K and the same reaction is 50 complete in 5 minutes at 350 K. Calculate the activation energy if it is a first order reaction. Given: \[ R = 8.314 \, \text{J K}^{-1} \, \text{mol}^{-1}, \quad \log 4 = 0.602 \]
- CBSE CLASS XII - 2025
- Organic Reactions
- Using integration, find the area of the region bounded by the line \[ y = 5x + 2, \] the \( x \)-axis, and the ordinates \( x = -2 \) and \( x = 2 \).
- CBSE CLASS XII - 2025
- Evaluation of Definite Integrals by Substitution
- In case the total cost of a machine less installation charges is greater than Rs 2,00,000, then 20% depreciation is charged, and if total cost of the machine is less than Rs 2,00,000 then 10% depreciation is charged.
Write the steps to create the 'IF' function using the Formula tab and dialogue box on a given spreadsheet. Also, write the syntax of the result.- CBSE CLASS XII - 2025
- Computerised Accounting
- Name the error which occurs when Excel doesn't recognize a Text formula. Give any two solutions to correct it.
- CBSE CLASS XII - 2025
- Basic Knowledge of Excel
- Null value is the special value which represents :
- CBSE CLASS XII - 2025
- Computerised Accounting