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Most Important Selected Qs for JEE AdvancedPhysicsElectrostatics

A particle of mass m and charge -q has been projected from ground as shown in the figure below. Mark out the correct statements (s) :-

Options

  1. AThe path of motion of the particle is parabolic
  2. BThe path of motion of the particle is a straight line
  3. CTime of flight of particle is 2 u g
  4. DRange of motion of the particle will be less than u^2 2 g

Correct answer

D. Range of motion of the particle will be less than u^2 2 g

Step-by-step solution

Along X axis, u _ x = u , a _ x =- qE m Along Y axis, u _ y = u , a _ y =- g Equations of motion along X and Y axes would be x=u t- q E 2 m t^2 and y=u t- 1 2 g t^2 Time of flight remains unchanged as vertical motion is not affected by E . Range of the particle in the present case is always less than u^2 2 ~g whatever be the value of E. R = x _ t = T = u 2 u g - 1 2 qE m [ 2 u g ]^2 u ^2 2 ~g

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