COMEDK · Physics · 17. Electrostatics
Two point charges \(20 \mu \mathrm{C}\) and \(-10 \mu \mathrm{C}\) are separated by a distance of \(1 \mathrm{~m}\) in air. At what point on the line joining the two charges, the electric potential is zero.
- A \(0.67 \mathrm{~m}\) from the charge \(20 \mu \mathrm{C}\)
- B \(0.5 \mathrm{~m}\) from the charge \(10 \mu \mathrm{C}\)
- C \(0.76 \mathrm{~m}\) from the charge \(20 \mu \mathrm{C}\)
- D \(0.25 \mathrm{~m}\) from the charge \(10 \mu \mathrm{C}\)
Answer & Solution
Correct Answer
(A) \(0.67 \mathrm{~m}\) from the charge \(20 \mu \mathrm{C}\)
Step-by-step Solution
Detailed explanation
Let the two charges be \(q_1 = 20 \times 10^{-6} \text{ C}\) and \(q_2 = -10 \times 10^{-6} \text{ C}\), separated by a distance \(d = 1 \text{ m}\). Let the point where the electric potential is zero be at a distance \(x\) from \(q_1\) along the line joining the charges. The…
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
- For an ideal gas, coefficient of volume expansion is given byCOMEDK 2021 Medium
- The graph of kinetic energy of photoelectron versus frequency of incident radiation is shown for two metals \(M\) and \(N\). We may definitely conclude
COMEDK 2012 Easy - A spring of force constant \(k\) is cut into lengths of ratio \(1 : 3 : 4\). They are connected in series and the new force constant is \(k'\). Then they are connected in parallel and force constant is \(k''\). Then \(k' : k''\) isCOMEDK 2023 Medium
- When \({ }^{10} \mathrm{~B}_5\) nuclei are bombarded by neutrons, one of the resultant nuclei is \({ }^7 \mathrm{Li}_3\). Then the emitted particle will be:COMEDK 2025 Easy
- In Young's double slit interference experiment, using two coherent waves of different amplitudes, the intensities ratio between bright and dark fringes is 3 . Then, the value of the ratio of the amplitudes of the wave that arrive there isCOMEDK 2023 Medium
- An open pipe immersed in water to half its length. The ratio of the fundamental frequency of the pipe before and after immersion in water isCOMEDK 2012 Medium
More PYQs from COMEDK
- Identify the correct IUPAC name of the following compound.
\(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CN}\)COMEDK 2015 Easy - Choose the statements which are incorrect in the case of Lanthanoids.
A. \(\mathrm{Ce}^{4+}\) is diamagnetic while \(\mathrm{Sm}^{3+}\) is paramagnetic.
B. The atomic size of the transition metals having atomic number greater than 71 are very close to that of the elements above them.
C. Lanthanoids react with hot water forming water soluble \(\mathrm{Ln}(\mathrm{OH})_3\) with the liberation of \(\mathrm{O}_2\).
D. The general electronic configuration of Lanthanoids is \((n-2) f^{1-14} 5 d^0 6 s^2\), where \(n=6\).COMEDK 2025 Medium - For the reaction, \(\mathrm{Fe}_{2} \mathrm{O}_{3}+3 \mathrm{CO} \longrightarrow 2 \mathrm{Fe}+3 \mathrm{CO}_{2}\), the volume of carbon monoxide required to reduce one mole of ferric oxide isCOMEDK 2017 Medium
- An object is placed at an unknown distance from a convex objective lens of focal length 8 cm. The objective lens forms a real image which acts as an object for a convex eyepiece of focal length 6.25 cm. The distance between the objective and eyepiece is 45 cm. The microscope is adjusted so that the final image is formed at the least distance of distinct vision (25 cm). Which of the following is correct?COMEDK 2026 Medium
- The shortest distance between the lines \(\frac{x-3}{3}=\frac{y-8}{-1}=\frac{z-3}{1}\) and \(\frac{x+3}{-3}=\frac{y+7}{2}=\frac{z-6}{4}\) is
\(\begin{array}{ll}\text { a. } \sqrt{30} \quad \text { b. } 2 \sqrt{30} & \text { c. } 5 \\ \lim _{x \rightarrow \infty}\left(\sqrt{a^{2} x^{2}+b x+x}-a x\right) & =\end{array}\)COMEDK 2015 Medium - The correct increasing order of basic strength of following amines,
\(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{NH}_{2}, \mathrm{NH}_{3},\left(\mathrm{C}_{2} \mathrm{H}_{5}\right)_{2} \mathrm{NH}_{6} \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{NH}_{2}\) in gaseous state isCOMEDK 2015 Medium