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JEE Main20248 Apr 2024Morning ShiftPhysicsMagnetic Effects of CurrentActual

An electron with kinetic energy 5 eV enters a region of uniform magnetic field of 3 T perpendicular to its direction. An electric field E is applied perpendicular to the direction of velocity and magnetic field. The value of E , so that electron moves along the same path, is _______ NC ⁻¹ . ( . Given, mass of electron =9 10⁻³¹ ~kg , electric charge .=1.6 10⁻¹⁹ C )

Correct answer

0

Step-by-step solution

For the given condition of moving undeflected, net force should be zero. aligned qE & = qVB E & = VB & = 2 KE m B & = 2 5 1.6 10⁻¹⁹ 9 10⁻³¹ 3 10⁻⁶ & =4 ~N / C aligned

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