A uniform electric field and magnetic field are parallel and point in the same direction. An electron with velocity "v" projected in the same direction will:
Correct answer: C. Move with decreased velocity
- A. Turn to the left
- B. Turn to the right
- C. Move with decreased velocity
- D. Move with the same velocity
Explanation
FB = qvBsin0o = 0 Fe = qE = 0 As the electron moves along the electric field. The electric force acts on electron opposite to its direction of motion. So, its speed decreases.
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About Electromagnetic Induction
Changing magnetic flux induces an emf according to Faraday's law, while Lenz's law gives the direction that opposes the change producing it. Transformers apply induction between coils to step alternating voltage up or down, with turns ratio, current transformation and energy losses determining practical operation.
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