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Saturday, 31 October

JEE Main 2020 · PhysicsMultiple choiceDiagram basedMediumData or graph

JEE Main 8 January 2020, Shift 2, Physics Q13

Question 13 of 75 in this shift, Physics question 13 of 25, Section A.

A particle of mass m and charge q is released from rest in a uniform electric field. If there is no other force on the particle, the dependence of its speed vv on the distance xx travelled by it is correctly given by (graphs are schematic and not drawn to scale)

The figure, in words

Each of the four options is a graph with axes labelled v (vertical) and x (horizontal); see option text.
  1. (1)[figure: Graph of v (vertical axis) against x (horizontal axis): straight line rising from the origin.]
  2. (2)[figure: Graph of v against x: curve starting at the origin, rising with increasing slope (curving upward).]
  3. (3)[figure: Graph of v against x: curve starting at the origin, rising steeply and flattening toward a plateau (curving downward).]Official answer
  4. (4)[figure: Graph of v against x: S-shaped curve from the origin, rising slowly, then steeply, then levelling off.]

Official answer

Option 3

NTA final key (Jan 2020).

Chapter
Electric Charges and Fields
Topic
Electric Field
Idea tested
Charged Particle Trajectory in Uniform Field

Same idea in other shifts

Asked 3× in all
  1. 29 Jun 2022, Shift 1 · Q48A positive charge particle of 100 mg is thrown in opposite direction to a uniform electric field of strength…EasySingle correct
  2. 25 Feb 2021, Shift 2 · Q10An electron with kinetic energy K1K_1 enters between parallel plates of a capacitor at an angle ‘α\alpha’ with the plates. It leaves the…MediumSingle correct

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.