AP EAMCET · PHYSICS · Electrostatics
Two unit negative charges are placed on a straight line. A positive charge \(q\) is placed exactly at the mid point between these unit charges. If the system of these three charges is in equilibrium, the value of \(q\) (in \(\mathrm{C}\) ) is
- A \(1.0\)
- B \(0.75\)
- C \(0.5\)
- D \(20 \mathrm{~cm}\)
Answer & Solution
Correct Answer
(D) \(20 \mathrm{~cm}\)
Step-by-step Solution
Detailed explanation
For equilibrium, we have \(F_{A B}+F_{A C}=0\) or \(\quad \frac{1}{4 \pi \varepsilon_0} \frac{q_1 q}{(d / 2)^2}+\frac{1}{4 \pi \varepsilon_0} \times \frac{q_1 q_2}{d^2}=0\) Given, \(\quad q_1=q_2=-1 \mu \mathrm{C}\) So, \(\quad-\frac{q}{(d / 2)^2}+\frac{1}{d^2}=0\)…
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from PHYSICS
- A radioactive sample has an activity \(A\) in air. If the sample is kept inside water, then its activity \(A^{\prime}\)AP EAMCET 2020 Easy
- AP EAMCET 2020 Medium
- A conducting rod of length \(L\) rotates with angular speed \(\omega\) in a uniform magnetic field of induction \(B\) which is perpendicular to its motion. The induced emf developed between the two ends of the rod isAP EAMCET 2002 Easy
- A mixture of Yellow light of wavelength and blue light of wave length is incident normally on an air film of thickness \(2.9 \times 10^{-4} \mathrm{~mm}\). The colour of reflected light isAP EAMCET 2020 Hard
- The second line of Balmer series has wavelength \(4861 Å\). The wavelength of the first line of Balmer series isAP EAMCET 2020 Medium
- Magnetic field induction at the centre of a circular coil of radius \(5 \mathrm{~cm}\) and carrying a current \(0.9 \mathrm{~A}\) is (in SI units) \(\left(\varepsilon_0=\right.\) absolute permittivity of air in SI units, velocity of light \(=3 \times 10^8 \mathrm{~ms}^{-1}\) )AP EAMCET 2005 Medium
More PYQs from AP EAMCET
- Identify the reaction in which monobasic and dibasic acids are formed.AP EAMCET 2018 Easy
- The gravitational field in a region is given by \(\mathbf{E}=(5 \hat{\mathbf{i}}+12 \hat{\mathbf{j}}) \mathrm{Nkg}^{-1}\). If a particle of mass \(2 \mathrm{~kg}\) is moved from the origin to the point \((12 \mathrm{~m}\), \(15 \mathrm{~m}\) ) in this region, the change in gravitational potential energy isAP EAMCET 2019 Medium
- A machine with efficiency \(2 / 3\) used 12 J of energy in lifting 2 kg block through certain height and it is allowed to fall through the same. The velocity while it reach the ground isAP EAMCET 2024 Medium
- A uniform chain has a mass ' ' and length '. It is held on a frictionless table with one-sisth of its length hanging over the edge. The work done in just pulling the hanging part back on the table is:AP EAMCET 2021 Medium
- The shortest distance between the lines \(\mathbf{r}=3 \mathbf{i}+5 \mathbf{j}+7 \mathbf{k}+\lambda(\mathbf{i}+2 \mathbf{j}+\mathbf{k}) \quad\) and \(\mathbf{r}=-\mathbf{i}-\mathbf{j}-\mathbf{k}+\mu(7 \mathbf{i}-6 \mathbf{j}+\mathbf{k})\) isAP EAMCET 2013 Medium
- In an experiment, two polariods are arranged such that the intensity of the polarised light emerged from the second polaroid is \(37.5 \%\) of the intensity of the unpolarised light incident on the first polaroid. Then the angle between the axes of the two polaroids isAP EAMCET 2025 Medium