Student Login

Home›Chapters›Electrostatics PYQs›Electric Charge & Coulomb's Law›Question 55

MHT CET 2021 (22 Sep, Shift 1) · Electric Charge & Coulomb's Law

Electric Charge & Coulomb's Law question from MHT CET 2021 (22 Sep, Shift 1)

Q55MHT CET 2021 · 22 SEP · SHIFT 1Easy

Electric Charge & Coulomb's Law

A point charge $Q$ is placed at the centre of the line joining two equal point charges $+q$ and $+q$ . The value of $Q$ if the system of the charges is in equilibrium, is

Show answer and solution

Answer: (b)

For an end charge $+q$ (separation $2r$ ): $\dfrac{kq^2}{(2r)^2} + \dfrac{kqQ}{r^2} = 0$ .
$Q = -\dfrac{q}{4}$
So the answer is (b) $-\dfrac{q}{4}$ .

Report a mistake

More questions on Electric Charge & Coulomb's Law

Two particles A and B having charges 20 μ C and -5μ C respectively are held fixed with a…JEE Main 2021 (31 Aug, Shift 1)
Two point charges +3 and +8 repel each other with a force of 40 N. If a charge of -5 is…MHT CET 2021 (23 Sep, Shift 2)
Two identical conducting spheres with negligible volume have 2.1 nC and - 0.1 nC charges…JEE Main 2021 (25 Feb, Shift 2)
An infinite number of point charges, each carrying 1 μ C charge, are placed along the…JEE Main 2021 (18 Mar, Shift 2)
Two identical tennis balls each having mass 'm' and charge 'q' are suspended from a fixed…JEE Main 2021 (27 Jul, Shift 1)
Two small spheres each of mass 10 mg are suspended from a point by threads 0.5 m long…JEE Main 2021 (25 Feb, Shift 2)
The acceleration of an electron due to the mutual attraction between the electron and a…NEET 2020 (Phase 2)
In case of dimensions of electric field and electric dipole moment the power of mass is…MHT CET 2019 (3 May, Shift 1)