AP EAMCET · PHYSICS · Electrostatics
Three point charges \(1 \mathrm{C},-2 \mathrm{C}\) and \(-2 \mathrm{C}\) are placed at the vertices of an equilateral triangle of side 1 metre. The work done by an external force to increase the separation of the charges to 2 metre in joule is ( \(\varepsilon_0=\) permittivity of air)
- A \(\frac{1}{4 \pi \varepsilon_0}\)
- B \(\frac{1}{8 \pi \varepsilon_0}\)
- C \(\frac{1}{16 \pi \varepsilon_0}\)
- D \(zero\)
Answer & Solution
Correct Answer
(D) \(zero\)
Step-by-step Solution
Detailed explanation
Work done by the external force must be zero.
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
- If a unit positive charge is taken from one point to another over an equipotential surface, thenAP EAMCET 2020 Easy
- A short bar magnet produces a magnetic field of \(6.4 \times 10^{-5} \mathrm{~T}\) at a distance of \(20 \mathrm{~cm}\) from the centre of the magnet on the normal bisector of the magnet. The magnetic field produced by this magnet at a distance of \(40 \mathrm{~cm}\) from the centre of the magnet on the axis, isAP EAMCET 2022 Easy
- Two point charges \(-5 \mu \mathrm{C}\) and \(+5 \mu \mathrm{C}\) are placed at \(\mathrm{A}\) and \(\mathrm{B}\) respectively on a straight line separated by \(5 \mathrm{~cm}\). At a point \(\mathrm{C}\) if the resultant field is parallel to the line joining the points \(A\) and \(B\) thenAP EAMCET 2018 Easy
- Two identical thin bar magnets each of length \(l\) and pole strength \(m\) are placed at right angles to each other with north-pole of one touching south-pole of the other, then the magnetic moment of the system isAP EAMCET 2022 Medium
- A particle moves in the \(x y\)-plane with velocity \(\mathbf{v}=x \hat{\mathbf{i}}+y t \hat{\mathbf{j}}\). At \(t=\frac{x \sqrt{3}}{y}\), theAP EAMCET 2018 Medium
- Two metal wires of same length, same area of crosssection have conductivities of their material \(\sigma_1\) and \(\sigma_2\). If they are connected in series, the effective conductivity isAP EAMCET 2023 Medium
More PYQs from AP EAMCET
- If is a Poisson variate such that then the standard deviation of isAP EAMCET 2019 Easy
- If \((a+\sqrt{2} b \cos x)(a-\sqrt{2} b \cos y)=a^2-b^2\) where \(a>b>0\), then at \(\left(\frac{\pi}{4}, \frac{\pi}{4}\right)\),
\(\frac{\mathrm{dy}}{\mathrm{dx}}=\)AP EAMCET 2025 Medium - In the given circuit, the angular frequency of the voltage source is \(70 \times 10^3 \mathrm{rad} \mathrm{s}^{-1}\). The circuit effectively behaves like,
AP EAMCET 2019 Easy - The radius of the first orbit of \(\mathrm{Li}^{2+}\) is \(\mathrm{X} Å\). The radius of the third orbit of \(\mathrm{He}^{+}\)(in \(Å\) ) isAP EAMCET 2022 Medium
- AP EAMCET 2020 Easy
- If the pairs of straight lines \(x^2-2 q x y-y^2=0\) and \(x^2-2 p x y-y^2=0\) bisect the angles between each other, then which of the following is correct?AP EAMCET 2020 Easy