Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Main202120 Jul 2021Morning ShiftPhysicsElectrostaticsActual

A certain charge Q is divided into two parts q and ( Q - q ) . How should the charges Q and q be divided so that q and ( Q - q ) placed at a certain distance apart experience maximum electrostatic repulsion?

Options

  1. AQ = q 2
  2. BQ = 2 q
  3. CQ = 4 q
  4. DQ = 3 q

Correct answer

B. Q = 2 q

Step-by-step solution

F q = k q ( Q - q ) L 2 = k L 2 q Q - q 2 d F d q = 0 when force is maximum d F d q = k L 2 [ Q - 2 q ] = 0 ⇒ Q - 2 q = 0 ⇒ Q = 2 q

Practice Electrostatics on Quantrex Academy →

More from Electrostatics

Two charges Q₁ = q and Q₂ = mq are placed at the points P₁(a, b) and P₂(ma, mb) , respectively, in the XY plane, where a, b 0 and m 0, 1 . If V₁ is the potential at a point in the 2026Consider an electric dipole comprising two charges +q and -q each with mass m , separated by a fixed distance d and initially at rest with its dipole moment pointing along i . A un 2026Two point charges q₁=3 , C and q₂=-4 , C are placed at points (2 i +3 j +3 k ) and ( i + j + k ) respectively. Force on charge q₂ is ________ N. ( Take 1 4 ₀ = 9 10^9 SI Units ) 2026The electric potential as a function of x, y is given by V = 5(x^2 - y^2) V. The electric field at a point (2, 3) m is __________ V/m. 2026A thin half ring of radius 35 cm is uniformly charged with a total charge of Q coulomb. If the magnitude of the electric field at centre of the half ring is 100 V/m, then the value 2026A three coulomb charge moves from the point (0, -2, -5) to the point (5, 1, 2) in an electric field expressed as E = 2x i + 3y^2 j + 4 k N/C. The work done in moving the charge is 2026A particle of charge q and mass m is projected from origin with an initial velocity v = ( v₀ 2 x + v₀ 2 y ) . There exists a uniform magnetic field B = B₀ z and a space varying ele 2026A rigid dipole undergoes a simple harmonic motion about its centre in the presence of an electric field E ₁=E₀ x . If another electric field E ₂=2E₀( y + z ) is introduced to the s 2026 Full Electrostatics list All JEE Main PYQs