Test Index

JEE Advanced 2020 Paper 1

SECTION - 3

For each question, enter the correct numerical value of the answer using the mouse and the on-screen virtual numeric keypad in the place designated to enter the answer. If the numerical value has more than two decimal places, truncate/round-off the value to TWO decimal places.

Question : 15

Total: 54

One end of a spring of negligible unstretched length and spring constant k is fixed at the origin (0,0) . a point particle of mass m carrying a positive charge q is attached at its other end. The entiresystem is kept on a smooth horizontal surface. When a point dipole

→

pointing towards the chargeq is fixed at the origin, the spring gets stretched to a length I and attains a new equilibrium position (see figure below). If the point mass is now displaced slightly by Δl<<l from its equalibrium positionand released, it is found to oscillate at frequency

√

. The value of δ is________.

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