Quantrex Academy · Free JEE Advanced PYQ solutions
JEE Advanced Physics Motion In Two Dimensions 2020 JEE Advanced 2020 (Paper 1)

JEE Advanced Physics Question (2020) — Solution

Question

A uniform electric field, E → = - 400 3 j ^ N C - 1 is applied in a region. A charged particle of mass m carrying positive charge q is projected in this region with an initial speed of 2 10 × 10 6 m s - 1 . This particle is aimed to hit a target T , which is 5 m away from its entry point into the field as shown schematically in the figure. Take q m = 10 10 C kg - 1 . Then

Options

  1. A. the particle will hit T if projected at an angle 45 ° from the horizontal
  2. B. the particle will hit T if projected either at an angle 30 °  or  60 ° from the horizontal
  3. C. time taken by the particle to hit T could be 5 6 μ s as well as 5 2 μ s
  4. D. time taken by the particle to hit T is 5 3 μ s

Answer

C. time taken by the particle to hit T could be 5 6 μ s as well as 5 2 μ s

Step-by-step solution

a y = E M = 4 3 × 10 12 m s 2 R = u 2 sin 2 θ a y sin 2 θ = R a y u 2 = 3 2 θ = 30 ° or 60 ° T = 2 u sin 30 ° a y or 2 u sin 60 ° a y = 5 6 μ s or 5 2 μ s

Practice more on Quantrex App →

Related: Physics — Motion In Two Dimensions · All PYQ Banks