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KCET2012PhysicsMagnetic Effects of Current

Pick out the wrong statement.

Options

  1. AAn electron at rest experiences no force in the magnetic field
  2. BThe gain in the KE of the electron moving at right angles to the magnetic field is zero
  3. CWhen an electron is shot at right angles to the electric field, it traces a parabolic path
  4. DAn electron moving in the direction of the electric field gains KE

Correct answer

D. An electron moving in the direction of the electric field gains KE

Step-by-step solution

Electron is negatively charged, hence experiences electrostatic force opposite to the direction of electric field. As a result, an electron moving in the direction of electric field loses kinetic energy.

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