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JEE Advanced2024PhysicsMagnetic Effects of CurrentActual

A positive, singly ionized atom of mass number A_ M is accelerated from rest by the voltage 192 ~V . Thereafter, it enters a rectangular region of width w with magnetic field B ₀=0.1 k Tesla, as shown in the figure. The ion finally hits a detector at the distance x below its starting trajectory. [Given: Mass of neutron/proton =(5 / 3) 10⁻²⁷ ~kg , charge of the electron =1.6 10⁻¹⁹ C .] Which of the following option(s)

Options

  1. AThe value of x for H⁺ ion is 4 ~cm .
  2. BThe value of x for an ion with A_ M =144 is 48 ~cm .
  3. CFor detecting ions with 1 A_ M 196 , the minimum height (x₁-x₀ ) of the detector is 55 ~cm .
  4. DThe minimum width w of the region of the magnetic field for detecting ions with A_ M =196 is 56 ~cm .

Correct answer

A. The value of x for H⁺ ion is 4 ~cm .

Step-by-step solution

aligned & x =2 R & x =2 P qB x = 2 2 mqV qB x = 2 ~B 2 mV q aligned Option A For H ⁺ m = 5 3 10⁻²⁷ ~kg x= 2 0.1 2 5 3 10⁻²⁷ 192 1.6 10⁻¹⁹ =4 ~cm Option B For A _ m =144x= 2 0.1 2 144 5 3 10⁻²⁷ 192 1.6 10⁻¹⁹ =48 ~cm Option C for A _m=1 x =4 ~cm & for A _ m =196 x =56 ~cm . so x ₀=4 ~cm & x ₁=56 ~cm x ₁- x ₀=52 ~cm . Option D Minimum width =R for A _ M =196 aligned & R = P qB = 2 mqV qB & R = 1 ~B 2 mV q & w _ = R = 1 0.1 2 196 5 3 10⁻²⁷ 192 1.6 10⁻¹⁹ =28 ~cm aligned

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