JEE Main 2020 (4 Sep, Shift 2) Physics Q11: Electric Field

Question

A particle of charge q and mass m is subjected to an electric field

E = E_0(1 - ax^2)

in the

x

-direction, where a and

E_0

are constants. Initially the particle was at rest at

x = 0

. Other than the initial position the kinetic energy of the particle becomes zero when the distance of the particle from the origin is :

Official answer

Option 4

NTA final key (Sep 2020).

Accepted Answer

Option 4: $\sqrt{\frac{3}{a}}$

Answer

a

Answer

$\sqrt{\frac{1}{a}}$

Answer

$\sqrt{\frac{2}{a}}$

Answer

$\sqrt{\frac{3}{a}}$

JEE Main 4 September 2020, Shift 2, Physics Q11