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NTA Abhyas JEE Main2020PhysicsMagnetic Effects of CurrentPractice

The figure shows two regions of uniform magnetic fields of strengths B and 2 B . A charged particle of mass m and charge q enters the region of the magnetic field with a velocity v = q B w m , where w is the width of each region of the magnetic field. The time taken by the particle to come out of the region of the magnetic field is

Options

  1. A4 π m q B
  2. B2 π m q B
  3. Cπ m 2 q B
  4. Dπ m q B

Correct answer

D. π m q B

Step-by-step solution

Time = π m 2 qB + π m 2 qB = π m qB

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