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NEET2013PhysicsMagnetic Effects of CurrentActual

When a proton is released from rest in a room, it starts with an initial acceleration a₀ towards west. When it is projected towards north with a speed v₀ it moves with an initial acceleration 3 a₀ towards west. The electric and magnetic fields in the room are

Options

  1. Am a₀ e west, 2 m a₀ e v₀ up
  2. Bm a₀ e west, 2 m a₀ e v₀ down
  3. Cm a₀ e east, 3 m a₀ e v₀ up
  4. Dm a₀ e east 3 m a₀ e v₀ down

Correct answer

B. m a₀ e west, 2 m a₀ e v₀ down

Step-by-step solution

Initial acceleration, a₀= E m aligned & E= a₀ m e e v₀ B+e E m =3 a₀ & or e v₀ B+e E=3 a₀ m & e v₀ B=3 m a₀-e E & =3 m a₀-m a₀ [ fromeq. (i)] & e v₀ B=2 m a₀ & B= 2 m a₀ e v₀ & aligned

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